Premenstrual Syndrome Guide: Symptoms, Causes, Diagnosis, and Treatment
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: September 2026
TL;DR: Premenstrual syndrome (PMS) is a predictable monthly pattern of emotional and physical symptoms — mood swings, tender breasts, food cravings, fatigue, irritability, and depression — that appears one to two weeks before your period and, for most women, disappears within four days after the period starts. It is estimated that as many as 3 of every 4 menstruating women experience some form of PMS. The exact cause is unknown, but cyclic hormone changes, serotonin fluctuations in the brain, and depression may all contribute. There are no lab tests for PMS; diagnosis rests on tracking symptoms across at least two menstrual cycles. Lifestyle changes — diet tweaks, at least 30 minutes of exercise most days, sleep, and stress reduction — help many women, while SSRIs (the first-line treatment for severe PMS or PMDD), NSAIDs, diuretics, and hormonal contraceptives cover more severe cases.
Quick Answer
What is PMS? A recurring monthly pattern of emotional and physical symptoms that starts one to two weeks before your period.
How common is it? As many as 3 in 4 menstruating women have experienced some form of PMS.
When does it end? For most women, symptoms disappear within four days after the period starts.
What causes it? The exact cause is unknown; cyclic hormone changes, brain serotonin fluctuations, and depression may contribute.
How is it treated? Lifestyle changes first (diet, exercise, sleep, stress reduction), then medications for severe cases — SSRIs are first-line for severe PMS or PMDD.
What is premenstrual syndrome, exactly?
Premenstrual syndrome (PMS) has a wide variety of signs and symptoms, including mood swings, tender breasts, food cravings, fatigue, irritability, and depression. It is estimated that as many as 3 of every 4 menstruating women have experienced some form of it.
The defining feature is timing. Symptoms recur in a predictable pattern each cycle, appearing in the week or two before your period. The physical and emotional changes can vary from just slightly noticeable all the way to intense.
The good news: you do not have to let these problems control your life. Treatments and lifestyle adjustments can help reduce or manage the signs and symptoms.
What are the signs and symptoms of PMS?
The list of potential signs and symptoms is long, but most women only experience a few of these problems. They fall into two groups.
Emotional and behavioral signs include tension or anxiety, depressed mood, crying spells, mood swings with irritability or anger, appetite changes and food cravings, trouble falling asleep, social withdrawal, poor concentration, and change in libido.
Physical signs include joint or muscle pain, headache, fatigue, weight gain related to fluid retention, abdominal bloating, breast tenderness, acne flare-ups, constipation or diarrhea, and alcohol intolerance.
For some, the physical pain and emotional stress are severe enough to affect daily life. Regardless of severity, the symptoms generally disappear within four days after the start of the menstrual period for most women.
Is it PMS or PMDD?
A small number of women with PMS have disabling symptoms every month. This form is called premenstrual dysphoric disorder (PMDD).
PMDD signs and symptoms include depression, mood swings, anger, anxiety, feeling overwhelmed, difficulty concentrating, irritability, and tension. If symptoms are disabling month after month, that is the signal to see a doctor.
When should you see a doctor?
If you have not been able to manage your PMS with lifestyle changes and the symptoms are affecting your health and daily activities, see your doctor.
You do not need to wait for a crisis. Symptoms that interfere with work, relationships, or everyday life every month deserve a proper evaluation — and treatment options exist for exactly that situation.
What causes premenstrual syndrome?
Exactly what causes premenstrual syndrome is unknown, but several factors may contribute.
Cyclic changes in hormones. Signs and symptoms change with hormonal fluctuations and disappear with pregnancy and menopause, which points to hormones as a driver.
Chemical changes in the brain. Fluctuations of serotonin — a brain neurotransmitter that plays a crucial role in mood states — could trigger symptoms. Insufficient serotonin may contribute to premenstrual depression, fatigue, food cravings, and sleep problems.
Depression. Some women with severe PMS have undiagnosed depression, though depression alone does not cause all of the symptoms.
How is PMS diagnosed?
There are no unique physical findings or lab tests that can positively diagnose PMS. Your doctor may attribute a particular symptom to PMS if it is part of your predictable premenstrual pattern.
The single most useful diagnostic tool is a symptom diary. Your doctor may have you record your signs and symptoms on a calendar or in a diary for at least two menstrual cycles, noting the day you first notice symptoms, the day they disappear, and the days your period starts and ends.
What else could it be?
Certain conditions mimic PMS, including chronic fatigue syndrome, thyroid disorders, and mood disorders such as depression and anxiety. Your provider may order tests — a thyroid function test or mood screening tests — to help provide a clear diagnosis.
Diagnostic step | What happens |
Symptom diary | Record symptoms for at least two menstrual cycles, marking onset, disappearance, and period dates |
Pattern check | Doctor looks for the predictable premenstrual timing |
Ruling out look-alikes | Chronic fatigue syndrome, thyroid disorders, depression, anxiety |
Targeted tests | Thyroid function test or mood screening tests when needed |
How is PMS treated?
For many women, lifestyle changes can relieve PMS symptoms. But depending on the severity of your symptoms, your doctor may prescribe one or more medications. The success of medications in relieving symptoms varies among women.
What can you do at home?
Modify your diet. Eat smaller, more-frequent meals to reduce bloating and the sensation of fullness. Limit salt and salty foods to reduce bloating and fluid retention. Choose foods high in complex carbohydrates, such as fruits, vegetables, and whole grains, and foods rich in calcium — or take a daily calcium supplement if you cannot tolerate dairy. Avoid caffeine and alcohol.
Incorporate exercise. Engage in at least 30 minutes of brisk walking, cycling, swimming, or other aerobic activity most days of the week. Regular daily exercise can improve your overall health and alleviate symptoms such as fatigue and a depressed mood.
Reduce stress. Get plenty of sleep. Practice progressive muscle relaxation or deep-breathing exercises to help reduce headaches, anxiety, or insomnia. Try yoga or massage to relax and relieve stress.
Record your symptoms for a few months. Keeping a record helps identify the triggers and timing of your symptoms, which allows you to intervene with strategies that may help lessen them.
What medications help?
Antidepressants. Selective serotonin reuptake inhibitors (SSRIs) — including fluoxetine (Prozac), paroxetine (Paxil, Pexeva), sertraline (Zoloft), and others — have been successful in reducing mood symptoms. SSRIs are the first-line treatment for severe PMS or PMDD. They are generally taken daily, but for some women use may be limited to the two weeks before menstruation begins.
NSAIDs. Nonsteroidal anti-inflammatory drugs such as ibuprofen (Advil, Motrin IB) or naproxen sodium (Aleve), taken before or at the onset of your period, can ease cramping and breast discomfort.
Diuretics. When exercise and limiting salt intake are not enough to reduce the weight gain, swelling, and bloating of PMS, water pills can help your body shed excess fluid through the kidneys. Spironolactone (Aldactone) is a diuretic that can ease some PMS symptoms.
Hormonal contraceptives. These prescription medications stop ovulation, which may bring relief from PMS symptoms.
Treatment class | Examples | How it helps |
SSRIs (antidepressants) | Fluoxetine, paroxetine, sertraline | First-line for severe PMS or PMDD; reduces mood symptoms; daily or only the two pre-period weeks |
NSAIDs | Ibuprofen, naproxen sodium | Eases cramping and breast discomfort when taken before or at your period |
Diuretics | Spironolactone | Sheds excess fluid that causes weight gain, swelling, and bloating |
Hormonal contraceptives | Prescription options that stop ovulation | May bring relief from PMS symptoms |
What about supplements and herbal remedies?
Vitamin supplements. Calcium, magnesium, vitamin E, and vitamin B-6 have all been reported to soothe symptoms, but evidence is limited or lacking.
Herbal remedies. Some women report relief with ginkgo, ginger, chasteberry (Vitex agnus), evening primrose oil, and St. John's wort. However, few scientific studies have found that any herbs are effective for PMS relief. Herbal remedies are not regulated by the FDA, so there is no record of product safety or effectiveness. Talk with your doctor before taking any herbal products — St. John's wort, for example, reduces the effectiveness of birth control pills.
Acupuncture. Some women experience symptom relief after acupuncture treatment, where a practitioner inserts sterilized stainless steel needles into specific points on the body.
How should you prepare for your appointment?
You are likely to start by seeing your family doctor or primary care provider; in some cases you may be referred to a gynecologist.
Before the appointment, write down the symptoms you are experiencing, list your key medical information including other conditions and all medications, vitamins, and supplements, and consider the questions you want to ask. Basic questions to bring along include whether anything can minimize your PMS symptoms, whether your symptoms will eventually go away on their own, and whether what you are experiencing could indicate a more serious medical condition.
Your doctor is likely to ask how severe your symptoms are, on which days of your cycle they are at their worst, whether you have symptom-free days, whether you can anticipate their onset, whether anything makes them better or worse, whether they interfere with your daily activities, and whether you or anyone in your family has been diagnosed with a psychiatric disorder.
Conclusion
Premenstrual syndrome is common — as many as 3 in 4 menstruating women experience some form of it — predictable, and highly manageable. The key insight is the pattern: symptoms that arrive one to two weeks before your period and clear within four days of it starting are very likely PMS. Lifestyle changes — smaller meals, less salt, complex carbohydrates and calcium, regular exercise, enough sleep, and stress reduction — are effective for many women. For more severe cases, SSRIs stand as the first-line treatment, with NSAIDs, diuretics, and hormonal contraceptives rounding out the options. If your symptoms are disabling month after month, whether that is PMS or its severe form PMDD, a doctor can help you sort it out.
Frequently Asked Questions
What is premenstrual syndrome?
PMS is a recurring monthly pattern of emotional and physical symptoms — mood swings, tender breasts, food cravings, fatigue, irritability, and depression — that appears one to two weeks before your period. It is estimated that as many as 3 of every 4 menstruating women experience some form of it.
How common is PMS?
Very common: as many as 3 in 4 menstruating women have experienced some form of premenstrual syndrome at some point.
How long do PMS symptoms last?
For most women, the signs and symptoms generally disappear within four days after the start of the menstrual period. They recur in a predictable pattern each cycle.
What causes PMS?
The exact cause is unknown. Cyclic changes in hormones, fluctuations of serotonin in the brain (which may contribute to premenstrual depression, fatigue, food cravings, and sleep problems), and undiagnosed depression in some women with severe PMS may all contribute.
Is PMS the same as PMDD?
No. A small number of women have disabling symptoms every month — that severe form is called premenstrual dysphoric disorder (PMDD). Its symptoms include depression, mood swings, anger, anxiety, feeling overwhelmed, difficulty concentrating, irritability, and tension.
How do doctors diagnose PMS?
There are no physical findings or lab tests that positively diagnose PMS. Diagnosis is based on a predictable premenstrual pattern, typically established by recording symptoms on a calendar or diary for at least two menstrual cycles. Conditions that mimic PMS — chronic fatigue syndrome, thyroid disorders, and mood disorders — may be ruled out with tests such as a thyroid function test.
What is the best treatment for PMS?
It depends on severity. For many women, lifestyle changes — modifying diet (smaller meals, less salt, complex carbs and calcium, avoiding caffeine and alcohol), at least 30 minutes of exercise most days, good sleep, and stress reduction — are enough. For severe PMS or PMDD, SSRIs are the first-line treatment, with NSAIDs, diuretics, and hormonal contraceptives as additional options.
Do vitamin supplements help PMS?
Calcium, magnesium, vitamin E, and vitamin B-6 have all been reported to soothe symptoms, but the evidence is limited or lacking. Herbal remedies such as chasteberry, ginger, ginkgo, and St. John's wort also have little scientific support, and St. John's wort can reduce the effectiveness of birth control pills — so talk with your doctor first.
References
Health information, not medical advice. This article is for general education and is not a substitute for professional diagnosis or treatment. Always consult a qualified healthcare provider about your own health, and seek emergency care for urgent symptoms.
Comments