Depressed thumb nails may be caused by external forces, or by diseases such as hypocalcemia, anemia, or fungal infections.
1. The role of external forces: only one thumb nail is sunken, need to know whether it is related to the role of external forces, such as trauma to the nail, which may lead to nail deformation or sunken.
2. Malnutrition: Malnutrition caused by various reasons will have an impact on the growth and development of nails, leading to nail malnutrition. For example, severe calcium deficiency, resulting in a lack of calcium in the body, leading to sunken nails.
3. Anemia: Anemia leads to insufficient oxygen-carrying capacity of the blood, resulting in weakness and pallor, and some patients may have sunken nails.
4. Fungal infection: Fungus invades the nail bed of the nail plate, resulting in changes in nail color and texture, nails will become brittle, yellow and thickened, and the surface is uneven.
Nail depression caused by external forces can be gradually recovered over time. If it is caused by pathological factors, early treatment is recommended.