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Have you noticed those tiny dark lines under your nails? Let us talk about splinter hemorrhages!

Dr. Priya Sammani (MBBS)
Medically Reviewed by Dr. Priya Sammani (MBBS) ✓ Medically Reviewed
📅 Updated: Oct 19, 2026 • ⏱ 3 min read • Editorial Policy
Have you noticed those tiny dark lines under your nails? Let us talk about splinter hemorrhages!

Have you ever looked closely at your fingernails or toenails and noticed a tiny red, brown, or black line running underneath? It might look like a tiny splinter of wood got stuck right under the nail plate. While you might be tempted to ignore it, this common sign is known in medicine as a splinter hemorrhage.

Although the name sounds a bit intense, it is often harmless and simply results from a minor bump. However, in some cases, these little lines can signal an underlying health condition that needs medical attention. Let us walk through everything you need to know about splinter hemorrhages in clear, simple terms.

Understanding what happens beneath your nails can help you stay calm, protect your health, and know exactly when to seek professional advice. Let us explore what these marks mean and how you can take care of your nail health every day.

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Frequently Asked Medical Questions (FAQ)

Evidence-based clinical answers to common patient questions

What is a splinter hemorrhage?

A splinter hemorrhage is a tiny line of trapped blood that looks like a wood splinter beneath your fingernail or toenail. It happens when tiny blood vessels called capillaries burst due to injury or underlying health conditions.

Do splinter hemorrhages go away on their own?

Yes, when caused by a minor physical injury, a splinter hemorrhage will simply grow out along with your nail over several weeks. No medical treatment is necessary for injury-related marks.

When should I worry about a splinter hemorrhage?

You should consult a doctor if you notice lines across multiple nails, if you did not injure your finger, or if the marks do not fade as your nail grows. You should also seek help right away if you experience a fever or other systemic symptoms.

Can medicines cause splinter hemorrhages?

Yes, certain medicines like blood thinners and specific cancer drugs can increase your chances of developing these small lines under your nails. Always speak with your doctor before changing any medicines.

Can nail psoriasis cause these lines?

Yes, nail psoriasis is a common inflammatory condition that affects the nail bed and often causes splinter hemorrhages alongside pitting and discoloration.

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Verified Scientific & Medical References (PubMed / WHO)

✓ Peer-Reviewed Sources
  1. Splinter hemorrhages look like tiny vertical reddish-brown lines under your nails.
  2. They usually happen because tiny blood vessels under your nail burst from a minor injury.
  3. Most single marks caused by physical bumps are harmless and grow out naturally with your nail.
  4. Multiple lines across several nails without any clear injury can point to underlying health issues.
  5. Always consult a doctor if you notice persistent, unexplained lines or experience other symptoms like a fever.
  6. They appear as very thin, delicate lines under the nail plate.
  7. They always align vertically in the direction of nail growth.
  8. They are usually about one to three millimeters in length.
  9. They often show up near the top edge of your nail, though they can appear anywhere.
  10. A fresh line usually looks bright red or deep purple.
  11. After a few days, the color typically fades to a dark brown or black.
  12. As your nail grows longer, the line moves upward toward the tip of your finger.
  13. You might have accidentally slammed your finger in a door.
  14. You could have stubbed your toe hard against a piece of furniture.
  15. Lifting heavy objects or gripping tools tightly can also put sudden pressure on your nail.
  16. Many people get artificial or acrylic nails applied at salons, and the application process can sometimes cause minor nail trauma.
  17. Nail Psoriasis: This is a common form of psoriasis, which is an autoimmune condition where your immune system attacks healthy cells. It often causes changes in your nails, including splinter hemorrhages.
  18. Lichen Planus: This inflammatory skin condition can cause itchy bumps and rashes. Studies show that about thirty-five percent of people with lichen planus develop splinter hemorrhages.
  19. Vasculitis: Inflammation of your blood vessels can cause them to weaken and leak, leading to these nail lines.
  20. Autoimmune Conditions: Conditions like lupus or antiphospolipid syndrome can trigger systemic inflammation and affect your delicate blood vessels.
  21. Infective Endocarditis: This is a serious bacterial infection of your heart valves. Between fifteen and thirty-three percent of people with endocarditis develop splinter hemorrhages. This makes spotting these lines a crucial diagnostic clue for doctors.
  22. Chronic Kidney Disease: People with long-term kidney issues often develop nail changes, especially those undergoing treatments like hemodialysis or people who have received a kidney transplant.
  23. Kinase Inhibitors: Certain cancer treatments, such as sunitinib or sorafenib, cause splinter hemorrhages in sixty to seventy percent of patients who take them.
  24. Blood Thinners: medicines that prevent blood clots, such as aspirin, warfarin, apixaban, or rivaroxaban, increase your chances of minor bleeding under the nail.
  25. Benign Growths: Very rarely, non-cancerous nail tumors like onychomatricoma can cause these lines.
  26. Subungual Melanoma: This is a rare form of skin cancer that develops underneath the nail. Because it can look similar to a splinter hemorrhage, any persistent or unexplained dark line should always be evaluated by a doctor.
  27. When did you first notice this line under your nail?
  28. Did you recently injure your nail or get a manicure with acrylics?
  29. Do you see similar lines on more than one nail?
  30. Are you having any other symptoms like a fever, joint pain, or unusual fatigue?
  31. Do you have any existing health conditions like diabetes or heart disease?
  32. Are you taking any prescription medicines, vitamins, or over-the-counter drugs?
  33. Eat a nutritious diet: Focus on foods rich in B vitamins and zinc, which support healthy nail growth. Leafy greens, nuts, and dairy products are great choices.
  34. Stay well hydrated: Drinking plenty of water keeps your skin and nails healthy and strong.
  35. Groom with care: Trim your fingernails carefully and avoid damaging the delicate skin around the edges.
  36. Wear protective gear: Use gloves when doing heavy chores, gardening, or lifting heavy objects to prevent accidental trauma.
  37. You do not remember injuring your nail at all.
  38. The line does not fade or grow out after a few weeks.
  39. You notice splinter hemorrhages appearing often.
  40. The lines show up across multiple nails simultaneously.
  41. You experience other symptoms like an unexplained fever, body aches, joint pain, or shortness of breath. Call 911 (US/Canada) or 999 (UK) or go to the nearest emergency department right away if you experience severe symptoms like chest pain or extreme breathing difficulty.
  42. The most common cause is minor trauma: Everyday bumps cause most lines, and they require no treatment as they simply grow out.
  43. Watch for warning signs: If you spot frequent lines across multiple nails without any known injury, it could point to an underlying condition like heart disease, kidney issues, skin disorders, or infections.
  44. Consult a professional: If you feel unsure or notice persistent lines, schedule a visit with a doctor to get a clear diagnosis and proper care.
  45. Prioritize nail health: Eat balanced meals, drink plenty of water, and protect your hands to keep your nails strong and healthy.
  46. Cleveland Clinic. Splinter Hemorrhage: Causes and When to See a Doctor. Available from: Cleveland Clinic Health Library.
  47. Mayo Clinic. Nail Abnormalities: Common Signs and Symptoms. Available from: Mayo Clinic Patient Care.
  48. National Health Service (NHS UK). Changes in Your Nails and What They Mean. Available from: NHS Health A-Z.
  49. Centers for Disease Control and Prevention (CDC). Skin and Nail Health Guidelines. Available from: CDC Publications.
  50. National Institutes of Health (NIH / PubMed). Clinical Significance of Splinter Hemorrhages in Systemic Disease. PMC Journal Archive.
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⚠️ Important: Medical articles and information on Nirogi Lanka are strictly for educational and awareness purposes and do not substitute professional medical advice, diagnosis, or treatment. Always consult a qualified physician for any medical concerns.