What Is von Willebrand Disease? A Plain-Language Guide to the Lifelong Bleeding Condition You're Usually Born With
Updated: 3 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Quick Answer
Von Willebrand disease is a lifelong bleeding condition in which blood is hard to clot because of low or poorly working von Willebrand factor, a clotting protein. [1] It is usually inherited. [1] [3] Signs include prolonged bleeding, long nosebleeds, heavy periods and easy bruising. [1] [3] There is no cure, but desmopressin and replacement therapies can prevent or stop bleeding. [2]
What the research says
Preventive treatment reduced bleeding in people with severe, recurring bleeds. A systematic review of 12 studies found that, in one placebo-controlled trial, von Willebrand factor prophylaxis cut the rate of bleeding episodes (rate ratio 0.24, 95% CI 0.17–0.35, low-certainty evidence) and of nosebleeds (rate ratio 0.38, 95% CI 0.21–0.67, moderate-certainty evidence) compared with no prophylaxis. Before-and-after studies pointed the same way, but that single trial could not rule out more serious adverse events (low-certainty evidence), and the authors call for more randomized trials. (El Alayli et al., Haemophilia, 2022) [7]
International guidelines spell out how to manage heavy periods, surgery, and childbirth. The 2021 ASH/ISTH/NHF/WFH management guideline made 12 recommendations, covering prophylaxis for frequent recurrent bleeding, desmopressin trials to guide therapy, antiplatelet and anticoagulant use, factor targets for major surgery, strategies for minor surgery or invasive procedures, options for heavy menstrual bleeding, and care during labor, delivery, and after birth. (Connell et al., Blood Adv, 2021) [5]
Diagnosis follows a defined set of tests and cutoffs. The companion diagnosis guideline made 11 recommendations on the role of bleeding-assessment tools, the diagnostic assays and laboratory cutoffs for type 1 and type 2 disease, how to approach a type 1 patient whose levels have normalized over time, and the role of genetic testing versus phenotypic assays for types 2B and 2N. (James et al., Blood Adv, 2021) [6]
What Is von Willebrand Disease?
von Willebrand disease is a lifelong bleeding condition that makes it hard for blood to clot. [1] People with the condition either have low levels of von Willebrand factor, a protein that helps blood clot, or the protein they have doesn't work well. [1]
Most people with the condition are born with it because the gene that causes it can be passed down from one or both parents. [1] But warning signs — such as heavy menstrual bleeding or bleeding for a long time after dental work — might not show up for years. [1]
The good news is that life with this condition can be very manageable. von Willebrand disease can't be cured, but there are treatments and self-care steps that can help people with this condition lead active lives. [1]
What Does von Willebrand Disease Look Like?
The most common symptom of von Willebrand disease is bleeding more than expected. [1] There are three main types of the condition, and the amount of bleeding varies from one person to another, depending on the type and how bad it is. [1]
If you have von Willebrand disease, you might have bleeding for a long time from an injury or after surgery or dental work. [1] Nosebleeds may last longer than 10 minutes. [1] Women may experience heavy or long menstrual bleeding, and heavy bleeding during labor and delivery or after delivery. [1] Some people notice blood in their urine or stool, easy bruising, or lumpy bruises. [1] With more-serious forms of the condition, there may be sudden bleeding into joints. [1]
What Are the Menstrual Warning Signs?
Menstrual symptoms can be a major clue, because they tend to repeat month after month. They might include blood clots greater than 1 inch (2.5 centimeters) across in menstrual blood, the need to change a menstrual pad or tampon more than once an hour, and the need to use double sanitary protection for menstrual flow. [1] Heavy bleeding can also cause symptoms of anemia, including tiredness or shortness of breath. [1]
Menstrual warning sign | What it looks like |
Large blood clots | Blood clots greater than 1 inch (2.5 centimeters) across in menstrual blood [1] |
Very frequent changes | The need to change a menstrual pad or tampon more than once an hour [1] |
Double protection | The need to use double sanitary protection for menstrual flow [1] |
Anemia symptoms | Tiredness or shortness of breath caused by heavy blood loss [1] |
An important caveat: many people with von Willebrand disease don't know they have it because they have no symptoms or the symptoms are mild. [1] That's part of why family history matters so much.
When Should You See a Doctor?
Contact your healthcare professional if you have bleeding that lasts a long time or is hard to stop. [1] Because symptoms can be mild and skip years, a pattern — recurring long nosebleeds, heavy periods, bruising easily since childhood — is worth mentioning even when any single episode seems minor.
What Causes von Willebrand Disease?
The usual cause of von Willebrand disease is a changed gene passed through families. [1] Conditions that happen in this way are called inherited. [1] The gene manages von Willebrand factor, a protein needed for blood clotting. [1]
Here is the chain of events: when you have low levels of this protein or the protein doesn't work as it should, small blood cells called platelets can't stick together well. The platelets also can't attach themselves to blood vessel walls after an injury. [1] This gets in the way of the clotting process, and sometimes it causes bleeding that is hard to stop. [1]
Many people with von Willebrand disease also have low levels of factor VIII, another protein that helps in clotting. [1]
Cause type | How it works |
Inherited (usual cause) | A changed gene passed through families manages von Willebrand factor; low levels or a faulty version stop platelets from sticking together and to blood vessel walls, disrupting clotting [1] |
Factor VIII shortage | Many people with the condition also have low levels of factor VIII, another clotting protein [1] |
Acquired (rare) | People who didn't get a changed gene from a parent can develop acquired von Willebrand syndrome later in life; the cause is likely another medical condition [1] |
Who Is at Higher Risk?
The main risk factor for von Willebrand disease is having a family history of it. [1] Parents pass down the gene that causes the condition to their children. [1]
The condition often is an autosomal dominant inherited disorder, which means you need a changed gene from only one parent to get the condition. [1] If you have the gene for von Willebrand disease, you have a 50% chance of passing on this gene to your children. [1] The most serious form of the condition is autosomal recessive — this means both of your parents pass a changed gene to you. [1]
How Serious Can It Get?
Rarely, von Willebrand disease can cause bleeding that won't stop, and this can be life-threatening. [1] Other complications include anemia, since heavy menstrual bleeding can cause iron deficiency anemia, and swelling and pain, which can result from bleeding in the joints or soft tissue. [1]
How Is von Willebrand Disease Diagnosed?
To diagnose von Willebrand disease, your healthcare professional asks about your medical and bleeding history and checks for bruises or other signs of recent bleeding. [2] Your healthcare professional may then order the following blood tests. [2]
Test | What it shows |
Von Willebrand factor antigen | The level of von Willebrand factor in your blood, by measuring a certain protein [2] |
Von Willebrand factor activity | How well the von Willebrand factor works in the clotting process [2] |
Factor VIII clotting activity | Whether your levels and activity of factor VIII are too low [2] |
Von Willebrand factor multimers | The form of von Willebrand factor in your blood — its proteins and how it breaks down; this test helps show the type of von Willebrand disease you have [2] |
One nuance worth knowing: the results of these tests can change in the same person over time due to factors such as aging, stress, exercise, infection, pregnancy, and medicines. [2] So you might need to repeat some tests. [2]
A healthcare professional who thinks you have a bleeding condition might send you to a specialist in blood conditions, called a hematologist. [2] If you have von Willebrand disease, your hematologist might suggest that blood relatives — such as parents, siblings, and children — have tests to see if this condition runs in your family. [2]
How Is It Treated?
von Willebrand disease has no cure. [2] But treatment can help prevent or stop bleeding. [2] Your treatment depends on the type of your condition and how bad it is, where the bleeding is and how bad it is, and your need for procedures such as dental work that may cause bleeding. [2]
Your hematologist might suggest one or more of the following treatments to raise the activity of your von Willebrand factor, strengthen blood clots, or manage heavy menstrual bleeding. [2]
Treatment | How it works | When it's used |
Desmopressin (DDAVP) | A human-made hormone given as a shot or through a vein; it manages bleeding by getting the body to release more von Willebrand factor stored in the lining of blood vessels [2] | Often the first treatment; also given before minor surgery; a trial dose confirms it works for you [2] |
Replacement therapies | Blood-clotting factors given through a vein containing von Willebrand factor and factor VIII [2] | If you can't take DDAVP or it hasn't worked; for adults 18 and older, a genetically engineered (recombinant) product with no plasma carries lower risk of viral infection or allergic reaction [2] |
Birth control pills | The estrogen can raise von Willebrand factor and factor VIII activity [2] | Helps manage heavy bleeding during menstrual periods, while also preventing pregnancy [2] |
Clot-stabilizing medicines | Also called antifibrinolytics — aminocaproic acid (Amicar) and tranexamic acid (Cyklokapron, Lysteda); they slow the breakdown of blood clots [2] | Often prescribed before or after surgery or a tooth extraction [2] |
Medicines to stop bleeding | A fibrin sealant (Tisseel) stops bleeding when applied to a cut by syringe or spray; over-the-counter products also stop nosebleeds [2] | Direct application to bleeding sites [2] |
If your condition is mild, your healthcare professional might suggest treatment only when you have surgery or dental work or when you've had an injury, such as from a car accident. [2]
What Self-Care Steps Help?
Four practical habits make day-to-day life with von Willebrand disease safer and easier.
Switch pain relievers. To help prevent bleeding, talk with your healthcare professional before you take pain relievers that thin the blood. These include aspirin, ibuprofen (Advil, Motrin IB, others), and naproxen sodium (Aleve). [2] Your healthcare professional might suggest acetaminophen (Tylenol, others) instead. [2]
Tell your healthcare team and dentist. Let them know you have von Willebrand disease before surgery or a dental procedure, before starting a new medicine, or when giving birth. [2] Also tell them whether anyone in your family has a history of too much bleeding. [2]
Wear a medical ID bracelet. Make sure it says that you have von Willebrand disease. [2] This can be helpful to medical workers if you're in an accident or taken to an emergency room. [2] Also carry a medical alert card in your wallet. [2]
Be active and safe. Exercise is part of reaching or staying at a healthy weight. [2] But stay away from activities that could cause bruising, such as football, wrestling, and hockey. [2]
Can It Be Prevented?
You can't prevent the condition itself, but you can plan ahead. If you plan to have children and have a family history of von Willebrand disease, think about getting genetic counseling. [1] If you carry the gene for von Willebrand disease, you can pass it down to your children even if you don't have symptoms. [1]
How Should You Prepare for Your Appointment?
You may start by seeing your main healthcare professional, who might send you to a specialist in the diagnosis and treatment of bleeding conditions, called a hematologist. [2]
When making the appointment, ask whether you need to fast before blood tests. [2] Then make a list of symptoms that involve bleeding — note how often, how badly, and for how long you bleed, including bruising, and let your team know if you've had a history of nosebleeds or easy bruising since childhood. [2] If you menstruate, note whether your periods are long and heavy. [2] Gather key personal information such as major stresses or recent life changes, and key medical information including other medical issues, whether anyone in your family bleeds easily, and all medicines, vitamins, and supplements you take with dosages. [2] Finally, write down questions to ask, and take a family member or friend along to help you remember the information you get. [2]
Questions you can ask | Questions your healthcare professional may ask |
What's the most likely cause of my symptoms? [2] | Have you had bleeding from a small wound that lasted more than 15 minutes or happened again within a week? [2] |
What treatment do you suggest, and how will I know whether it works? [2] | Have you had a nosebleed that lasted more than 10 minutes or needed medical attention? [2] |
What are the possible side effects of the medicines you're prescribing? [2] | Have you had easy bruising, or ever felt a lump under a bruise? [2] |
Does this condition raise my risk of other medical problems? [2] | How many days do your periods last, and how often do you change your pad or tampon? Have you seen blood clots? [2] |
What will I need to do before having surgery or dental work? [2] | Have you had blood in your stool that wasn't due to a known problem, such as a stomach ulcer or colon polyp? [2] |
Does this condition increase my risk of health issues during pregnancy and childbirth, and can the risk be lowered? [2] | Have you ever needed medical attention for bleeding during or after surgery, dental work, childbirth, or injury? [2] |
Do I need to stay away from certain physical activities or types of exercise? [2] | Have you had anemia or needed blood from a donor? [2] |
I have other health conditions — how can I best manage them together? [2] | — |
While you wait for your appointment, don't use pain relievers that can increase your risk of bleeding — aspirin, ibuprofen (Advil, Motrin IB, others), and naproxen sodium (Aleve). [2] If you need relief for aches and pains, try acetaminophen (Tylenol, others) instead. [2] Don't do contact sports known to have a high risk of bruising or injury, such as football and hockey. [2] Before having medical or dental procedures, tell your healthcare professional or dentist about your history of heavy bleeding from minor injuries. [2] And if you need a procedure that's not urgent, don't schedule it until after you've been checked for a bleeding condition. [2]
The Bottom Line
von Willebrand disease is a lifelong inherited bleeding condition that makes blood hard to clot, most often because a changed gene lowers von Willebrand factor or leaves it faulty, so platelets can't stick together or to blood vessel walls. [1] The warning signs are recognizable: bleeding that lasts a long time after injuries, surgery, or dental work; nosebleeds over 10 minutes; heavy or long menstrual bleeding with clots bigger than an inch; easy or lumpy bruising; and, in more-serious forms, bleeding into joints. [1] Many people never know they have it, which makes family history — and, when planning a family, genetic counseling — genuinely valuable. [1] While there is no cure, the treatment toolkit is strong: desmopressin (DDAVP) is often the first-line option [2], with replacement therapies, birth control pills, clot-stabilizing medicines, and fibrin sealants filling the gaps for heavier situations. Add simple self-care — swapping blood-thinning pain relievers for acetaminophen, telling every dentist and surgeon about the condition, wearing a medical ID, and staying active while avoiding contact sports [2] — and most people with von Willebrand disease lead full, active lives.
Take the Next Step
If you or your child bleeds longer than expected from cuts, nosebleeds over 10 minutes, easy or lumpy bruising, or heavy periods needing a change more than once an hour, ask your healthcare professional about von Willebrand disease [1] — the four blood tests are straightforward, and a hematologist can guide you from there. Before any surgery, dental work, or new medicine, make sure your care team knows your bleeding history, and consider a medical ID bracelet [2] so emergency teams know instantly. If you're planning children and the condition runs in your family, ask about genetic counseling, because the gene can be passed on even without symptoms. [1]
Frequently Asked Questions
What is von Willebrand disease?
Von Willebrand disease is a lifelong bleeding condition that makes it hard for blood to clot. [1] People with the condition either have low levels of von Willebrand factor — a protein that helps blood clot — or the protein they have doesn't work well. [1]
Is it curable?
No. von Willebrand disease can't be cured, but treatments and self-care can help people with the condition lead active lives by preventing or stopping bleeding. [1] [2]
How common is it, and when does it show up?
Most people with the condition are born with it because the gene that causes it can be passed down from one or both parents. [1] But warning signs, such as heavy menstrual bleeding or bleeding for a long time after dental work, might not show up for years — and many people don't know they have it because symptoms are mild or absent. [1]
What does bleeding more than expected actually look like?
Bleeding for a long time from an injury or after surgery or dental work, nosebleeds that last longer than 10 minutes, easy bruising or lumpy bruises, blood in urine or stool, and — in more-serious forms — sudden bleeding into joints. [1]
What are the menstrual warning signs?
Blood clots greater than 1 inch (2.5 centimeters) across in menstrual blood, needing to change a menstrual pad or tampon more than once an hour, needing double sanitary protection for menstrual flow, and anemia symptoms such as tiredness or shortness of breath. [1]
Why does the blood not clot properly?
When von Willebrand factor levels are low or the protein doesn't work as it should, small blood cells called platelets can't stick together well, and they can't attach themselves to blood vessel walls after an injury. [1] This gets in the way of the clotting process, sometimes causing bleeding that is hard to stop. [1]
How is it inherited?
The usual cause is a changed gene passed through families (an inherited condition). [1] It often is autosomal dominant, meaning a changed gene from only one parent gives you the condition — and if you carry the gene, you have a 50% chance of passing it to your children. [1] The most serious form is autosomal recessive, meaning both parents pass a changed gene to you. [1]
Can you develop it without inheriting it?
Rarely, yes. People who didn't get a changed gene from a parent can develop von Willebrand disease later in life. [1] This is called acquired von Willebrand syndrome, and the cause is likely another medical condition. [1]
What blood tests diagnose it?
Four blood tests: von Willebrand factor antigen (shows the level of the protein in your blood), von Willebrand factor activity (measures how well the factor works in clotting), factor VIII clotting activity (shows whether factor VIII levels and activity are too low), and von Willebrand factor multimers (checks the form and breakdown of the protein, helping to identify the type of disease). [2] Results can change over time due to aging, stress, exercise, infection, pregnancy, and medicines, so some tests may need repeating. [2]
Who treats it?
A hematologist — a specialist in blood conditions. [2] If you're diagnosed, your hematologist might suggest that blood relatives such as parents, siblings, and children get tested to see if the condition runs in your family. [2]
What is desmopressin (DDAVP)?
Desmopressin (DDAVP) is a human-made hormone given as a shot or through a vein. [2] It manages bleeding by getting the body to release more of the von Willebrand factor stored in the lining of blood vessels. [2] It's often the first treatment, can be given before minor surgery, and a trial dose can confirm it works for you. [2]
What are replacement therapies?
Replacement therapies involve receiving blood-clotting factors through a vein that contain von Willebrand factor and factor VIII, usually when you can't take DDAVP or it hasn't worked. [2] For adults 18 and older, there's also a genetically engineered (recombinant) von Willebrand factor product — made with changed DNA in a lab — that has no plasma, so it carries a lower risk of viral infection or allergic reaction. [2]
How do birth control pills help?
Besides preventing pregnancy, they can help manage heavy bleeding during menstrual periods, because the estrogen in birth control pills can raise von Willebrand factor and factor VIII activity. [2]
What are clot-stabilizing medicines?
Also called antifibrinolytics, they include aminocaproic acid (Amicar) and tranexamic acid (Cyklokapron, Lysteda). [2] They help stop bleeding by slowing the breakdown of blood clots, and healthcare professionals often prescribe them before or after surgery or a tooth extraction. [2]
How is treatment decided for mild cases?
If your condition is mild, your healthcare professional might suggest treatment only when you have surgery or dental work or when you've had an injury, such as from a car accident. [2]
Which pain relievers should I avoid?
Pain relievers that thin the blood — aspirin, ibuprofen (Advil, Motrin IB, others), and naproxen sodium (Aleve). [2] Talk with your healthcare professional before taking them; acetaminophen (Tylenol, others) is often suggested instead. [2]
What self-care steps make a difference?
Switching to safer pain relievers, telling your healthcare team and dentist about the condition before surgery, dental procedures, new medicines, or giving birth, wearing a medical ID bracelet (and carrying a medical alert card), and staying active while avoiding activities that could cause bruising, such as football, wrestling, and hockey. [2]
What complications can occur?
Rarely, bleeding that won't stop — which can be life-threatening. [1] Other complications include anemia from heavy menstrual bleeding (iron deficiency anemia) and swelling and pain from bleeding in the joints or soft tissue. [1]
Should I get genetic counseling?
If you plan to have children and have a family history of von Willebrand disease, yes — think about getting genetic counseling. [1] You can pass the gene to your children even if you don't have symptoms. [1]
Does it affect pregnancy and childbirth?
Heavy bleeding during labor and delivery or after delivery is a known symptom. [1] Your healthcare team can plan ahead, and discussing the condition before pregnancy helps manage the risk of bleeding and of health issues during pregnancy and childbirth.
Related Reading
Fibrinogen Test: Normal Range and What High or Low Fibrinogen Means explains the blood test for a key clotting protein.
References
Mayo Clinic Staff. Von Willebrand disease: Symptoms & causes. Mayo Clinic. Last updated September 15, 2025. Accessed October 15, 2026. https://www.mayoclinic.org/diseases-conditions/von-willebrand-disease/symptoms-causes/syc-20354978
Mayo Clinic Staff. Von Willebrand disease: Diagnosis & treatment. Mayo Clinic. Last updated September 15, 2025. Accessed October 15, 2026. https://www.mayoclinic.org/diseases-conditions/von-willebrand-disease/diagnosis-treatment/drc-20354984
Centers for Disease Control and Prevention. About von Willebrand disease. CDC. Last reviewed May 15, 2024. Accessed October 15, 2026. https://www.cdc.gov/von-willebrand/about/index.html
National Heart, Lung, and Blood Institute. Bleeding disorders. NHLBI, National Institutes of Health. Last updated August 3, 2023. Accessed October 15, 2026. https://www.nhlbi.nih.gov/health/bleeding-disorders
Connell NT, Flood VH, Brignardello-Petersen R, et al. ASH ISTH NHF WFH 2021 guidelines on the management of von Willebrand disease. Blood Adv. 2021;5(1):301-325. PMID: 33570647. https://doi.org/10.1182/bloodadvances.2020003264
James PD, Connell NT, Ameer B, et al. ASH ISTH NHF WFH 2021 guidelines on the diagnosis of von Willebrand disease. Blood Adv. 2021;5(1):280-300. PMID: 33570651. https://doi.org/10.1182/bloodadvances.2020003265
El Alayli A, Brignardello Petersen R, Husainat NM, et al. Outcomes of long-term von Willebrand factor prophylaxis use in von Willebrand disease: a systematic literature review. Haemophilia. 2022;28(3):373-387. PMID: 35339117. https://doi.org/10.1111/hae.14550
Medical disclaimer
This guide is for general information only and is not a substitute for professional medical advice, diagnosis, or treatment. In rare cases von Willebrand disease can cause bleeding that won't stop, which can be life-threatening — seek emergency care for severe or uncontrollable bleeding. Always seek the advice of a physician or other qualified health provider with any questions about a medical condition. Never disregard professional medical advice or delay seeking it because of something you have read here.
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