Who Is Most at Risk?
Risk factors include:
- Age over 50
- Frequent hand washing
- Repeated exposure to water
- Chemical exposure
- Nutritional deficiencies
- Thyroid disease
- Psoriasis
- Eczema
- Manual labor
- Nail biting
How Doctors Diagnose the Cause
A healthcare provider or dermatologist will usually begin with a physical examination and medical history.
Depending on your symptoms, additional tests may include:
- Blood tests for iron, vitamin B12, zinc, and thyroid function
- Nail clippings or scrapings to check for fungal infection
- Dermoscopy (a close examination of the nail)
- Nail biopsy in rare cases if a tumor or other serious condition is suspected
Treatment
Treatment depends on the underlying cause.
Possible options include:
- Treating nutritional deficiencies
- Managing thyroid disorders
- Antifungal medication if a fungal infection is confirmed
- Prescription creams for eczema or psoriasis
- Repairing or protecting the nail while it grows out
- Surgical treatment if an abnormal growth is found
Because fingernails grow slowly, improvement may take 4–6 months, while complete replacement of a fingernail can take 6–9 months.
Home Care Tips
You can help protect your nails by:
- Keeping nails trimmed short.
- Applying a fragrance-free moisturizer to your nails and cuticles daily.
- Wearing gloves when cleaning or washing dishes.
- Avoiding harsh nail products and excessive acetone.
- Eating a balanced diet rich in protein, iron, zinc, and vitamins.
- Avoiding nail biting or picking.
- Using nails only for their intended purpose—not as tools.
When Should You See a Doctor?
Arrange a medical evaluation if:
- The split extends to the base of the nail.
- Only one nail is affected and the split persists.
- The nail becomes painful or bleeds.
- The nail changes color (especially dark brown or black streaks).
- The surrounding skin becomes swollen or infected.
- Multiple nails become brittle or split suddenly.
- You also have symptoms such as fatigue, weight changes, or hair loss.
Can Nail Splitting Be Prevented?
Many cases can be prevented by:
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