Glomus Tumor: What It Is, Why It Happens, and How It's Treated
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 17, 2026
Quick Answer
A glomus tumor is a rare, benign tumor that usually grows under the nails [4]. It causes intense, sudden pain like an electric shock or needle prick, triggered by cold or light pressure on the nail [4]. It most commonly affects women in their 30s, 40s and 50s [4]. A simple surgical procedure to remove the tumor typically cures the condition [4].
What the research says
According to PubMed, research on glomus tumors comes mainly from expert reviews and case reports, so the findings below add context rather than large-trial evidence:
Complete removal is the key to a cure. A 2024 review of subungual glomus tumors found that diagnosis relies on the typical triad of symptoms plus imaging, mainly MRI, and that complete resection is essential for cure. Different surgical approaches aim for a painless finger with normal movement and sensation, no nail deformity, and prevention of recurrence. (Falcone et al., Hand Surg Rehabil, 2024) [1]
Diagnosis is often delayed, and surgery brought full relief in a reported case. A 2024 case report of a 42-year-old woman describes years of finger pain triggered by a knock or cold, a 7 mm tumor found on MRI, and complete pain relief after surgical removal. The authors note that the diagnosis is often missed for several years. One case cannot show how well this works in general. (O'Connor et al., S D Med, 2024) [2]
Cancerous glomus tumors are uncommon. A 2022 case report on a rare tumor of the ureter notes that approximately 1% of all glomus tumors are malignant, and that malignant ones in the urinary system are extremely rare. (Demir et al., J Coll Physicians Surg Pak, 2022) [3]
Study details are from PubMed abstracts.
What Is a Glomus Tumor?
A glomus tumor is a rare, benign growth that develops from glomus bodies, tiny structures in the skin responsible for regulating blood flow to the skin's surface. While these tumors can appear in various parts of the body, the most common location is subungual, meaning they form directly under the fingernails or toenails [4]. These tumors are typically very small, often comparable to the size of a pea [4], yet they can cause significant distress due to the intense pain they produce.
The condition is most frequently diagnosed in women during their 30s, 40s, and 50s [4]. Because glomus tumors are rare and their primary symptom, sharp pain, can be intermittent, it often takes time for healthcare providers to reach a definitive diagnosis [2]. However, once identified, the outlook is excellent, as surgical removal usually resolves the symptoms completely [4].
Term | Plain-Language Meaning |
Glomus Tumor | A rare, noncancerous growth that often forms under the nails. |
Glomus Body | A structure in the skin that helps control body temperature by regulating blood flow. |
Subungual | A medical term meaning "under the nail." |
Benign | A growth that is not cancerous and does not spread to other parts of the body. |
What Are the Symptoms of a Glomus Tumor?
The most defining characteristic of a glomus tumor is a sudden, stabbing pain that feels like a jolt of electricity or a needle being stuck under the nail [4]. Healthcare providers often look for a specific group of three symptoms, known as the glomus tumor triad [4].
The Glomus Tumor Triad
Severe Pain: Intense pain triggered by even the slightest pressure on the tiny spot where the tumor is located [4].
Cold Sensitivity: Sharp pain when the nail is exposed to cold water, snow, or cold wind [4].
Spontaneous Pain: Sudden jolts of pain that happen without any obvious warning or trigger [2].
In addition to pain, you might notice physical changes to the nail itself. These can include a tiny red or blue bump visible through the nail, or the nail may appear unusually thick or have a bulging shape [4].
What Causes a Glomus Tumor?
The exact reason why these tumors develop is not fully understood, but they occur when certain muscle cells in the glomus bodies begin to multiply abnormally. One leading theory suggests that a genetic variation may be responsible for this cell growth [4].
Risk Factors
While the cause remains somewhat mysterious, it is important to remember that these tumors are not related to any lifestyle choices and cannot be prevented.
How Is a Glomus Tumor Diagnosed?
Because glomus tumors are rare, diagnosis involves specific clinical tests designed to trigger the characteristic pain response. Your healthcare provider will likely ask detailed questions about the nature of your pain and what triggers it.
Diagnostic Tests
Love's Pin Test: A provider uses a pointed object, like a toothpick, to gently touch different areas of the nail. Identifying a specific, highly painful spot is a strong indicator of a tumor [4].
Hildreth Test: A blood pressure cuff is used to temporarily block blood flow to the arm. If the pain disappears when blood flow is restricted, it suggests a glomus tumor is present [4].
Cold Sensitivity Test: The affected finger is dipped in ice-cold water to see if the cold temperature triggers the sharp, electrical pain [4].
Imaging: MRI scans, X-rays, or ultrasounds may be used to visualize the small tumor and confirm its location [4] [1].
How Is a Glomus Tumor Treated?
The only effective way to treat a glomus tumor and stop the pain is through surgical removal [1]. This procedure is typically performed as an outpatient surgery and is considered a cure.
The Surgical Process
Numbing: The finger or toe is numbed using a local anesthetic so you won't feel any pain during the procedure [4].
Nail Removal: The healthcare provider carefully removes the nail to access the area underneath [4].
Tumor Removal: A small incision is made in the nail bed to remove the tumor and all abnormal cells [4].
Closing: The incision is closed with fine stitches, and a protective bandage is applied [4].
After the surgery, your nail will typically grow back completely within six to eight weeks [4]. A follow-up appointment is usually scheduled for three months later to ensure the area has healed properly and that there are no signs of the tumor returning [4].
Outlook and Recovery
The long-term outlook for individuals with a glomus tumor is excellent. Once the tumor is surgically removed, the sharp pain typically disappears immediately. While the condition is cured in the vast majority of cases, there is a small risk of the tumor returning if any abnormal cells were left behind during the initial surgery [4].
Comfort & Reassurance: If you have been living with mysterious, sharp pain under your nail, know that you are not alone. While frustrating to diagnose, a glomus tumor is noncancerous and highly treatable. Surgery is a straightforward path to living pain-free again.
When to Seek Medical Advice: If you experience sudden, sharp, or electrical pain in your finger or under a nail, especially if it is triggered by cold or light touch, schedule an appointment with a healthcare provider. Identifying the cause is the first step toward a permanent cure.
Get Clear Answers and Trusted Health Guidance. For more plain-language health guides written to help you make confident decisions, visit Rinnit.com.
Frequently Asked Questions
Is a glomus tumor cancerous?
No. Glomus tumors are benign, meaning they are noncancerous and do not spread to other parts of the body.
Why does it hurt so much if it's so small?
Glomus tumors grow from glomus bodies, which are densely packed with nerves. When the tumor puts pressure on these nerves, it causes intense pain.
Can a glomus tumor go away on its own?
No. Glomus tumors do not shrink or disappear without treatment. Surgery is required to remove the growth.
Will my nail look normal after surgery?
Yes. In most cases, the nail grows back completely and looks normal within a couple of months.
How common are glomus tumors?
Glomus tumors are considered rare, which is why it often takes several visits to different doctors before the condition is correctly diagnosed.
Can I get a glomus tumor in my toe?
Yes. While more common in fingers, glomus tumors can also develop under the toenails.
Does cold weather make the pain worse?
Yes. Sensitivity to cold is a hallmark symptom. Even a cold wind or cold water can trigger a jolt of pain.
Is the surgery painful?
The procedure itself is not painful because the area is numbed. You may have some mild soreness during the first few days of recovery.
Can children get glomus tumors?
A glomus tumor is very rare in children. Most cases occur in adults between the ages of 30 and 50.
What happens if I don't get surgery?
The tumor will remain, and the sharp, unpredictable pain will continue to affect your daily life and quality of life.
Is there any medication to stop the pain?
Standard pain relievers may offer temporary relief, but they do not address the cause. Surgery is the only permanent solution.
Can these tumors appear elsewhere?
Very rarely, they can form in the head, neck, or heart, but the vast majority are found under the nails.
How long does the surgery take?
The procedure is relatively quick, often taking less than an hour to complete.
What is the Love's pin test?
The Love's pin test is a simple clinical test where a doctor touches the nail with a fine point to locate the exact source of your pain.
Can a glomus tumor be seen on an X-ray?
Sometimes, but because they are soft tissue growths, an MRI or ultrasound is often better for seeing the tumor clearly.
References
Falcone MO, et al. Subungual glomus tumor. Hand Surg Rehabil. 2024;43S:101607. PMID 37866479. https://doi.org/10.1016/j.hansur.2023.10.001
O'Connor HA, et al. Digital Glomus Tumor - A Commonly Undiagnosed Cause of Finger Pain: Case Report. S D Med. 2024;77(1):37-41. PMID 38986147. https://pubmed.ncbi.nlm.nih.gov/38986147/
Demir M, et al. Malignant Glomus Tumor of the Ureter. J Coll Physicians Surg Pak. 2022;32(12):SS206-SS208. PMID 36597340. https://doi.org/10.29271/jcpsp.2022.Supp0.SS206
Cleveland Clinic. Glomus Tumor: Symptoms, Causes & Treatment. Cleveland Clinic. Last updated July 1, 2026. https://my.clevelandclinic.org/health/diseases/glomus-tumor
Medical disclaimer
This article is for general educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified healthcare provider with any questions you may have about a medical condition. Never disregard professional medical advice or delay seeking care because of something you have read here. If you think you may have a medical emergency, call your doctor or emergency services immediately.
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