What causes a white vertical line on the right thumb, and what should be done about it?

Generally, white vertical lines on the right thumb may be caused by factors such as nutritional imbalance, physical injury, nail dystrophy, onychomycosis, or lichen planus. Depending on the specific situation, improvements can be made through daily adjustments, medication, or physical treatments. A detailed analysis is as follows:

1. Nutritional Imbalance

Long-term picky eating can lead to insufficient intake of calcium, zinc, or vitamins, causing a lack of nutritional support for nail growth and resulting in vertical ridges. Adjust the diet by consuming more milk, lean meat, nuts, and fresh fruits and vegetables to ensure comprehensive nutrition.

2. Physical Injury

Compression, impact, or prolonged exposure to irritants can damage the nail plate, leading to abnormal growth and formation of vertical lines. Avoid putting pressure on the nails, wear gloves when doing household chores, trim nails to an appropriate length, and avoid cutting them too short.

3. Nail Dystrophy

Abnormal keratinization of the nail plate causes the nails to become thin, brittle, and develop white vertical lines, often accompanied by loss of shine. Under medical guidance, take vitamin AD soft capsules, zinc gluconate oral solution, or calcium carbonate D3 tablets to supplement nutrients and promote repair.

4. Onychomycosis (Fungal Nail Infection)

Fungal infection damages the nail structure, leading to white vertical lines, thickening, and brittleness of the nail. Follow doctor’s instructions to apply topical terbinafine hydrochloride cream or miconazole nitrate cream, take itraconazole capsules orally, and maintain dry and clean hands.

5. Lichen Planus

An autoimmune disorder affecting the nail matrix disrupts nail growth, causing white vertical lines; in severe cases, nails may fall out. Under medical supervision, use tacrolimus ointment or mometasone furoate cream. Phototherapy may be necessary in some cases.

Maintain good dietary habits daily and avoid nail trauma or irritation. If the vertical lines continue to deepen or widen, or are accompanied by other discomforts, seek medical attention promptly to determine the underlying cause. Consistent scientific care will help restore nail health.