White patches in the nails may be caused by ringworm of the nail, psoriasis, anemia and other diseases. 1. Ringworm of the nail: ringworm of the nail is mainly caused by dermatophyte infection, mostly due to direct infection of tinea pedis. Patients will appear nail plate turbidity, separation, discoloration, can be white, yellow, etc., manifested as white patches in the nails. 2. Psoriasis: the cause of psoriasis is not yet clear, may be genetic, low immunity, pathogen infection, excessive stress and other factors. Patients will have nail pitting, nail separation, nail turbidity, and some patients will have white patches in their nails. 3. Anemia: Anemia is mainly caused by insufficient production of red blood cells, blood loss and excessive destruction of red blood cells. Patients will experience weakness, nail bed pallor, and some patients may show white patches in the nails. There are many causes of white patches in nails (e.g. true white nails due to trauma, nail malnutrition, etc.), and patients are advised to identify the causes in time.