The color change of toenails may reflect some physical health conditions. If the toenails turn white, it may be caused by the following reasons: 1, anemia: insufficient intake of folic acid, vitamin B12 and iron may lead to anemia in patients and relatively poor blood circulation at the end of the extremities, which can make the toenails turn white. It may also be accompanied by other skin and mucous membrane whitening, as well as headache, dizziness, tinnitus, tiredness, inattention and other symptoms; 2, calcium deficiency: dietary imbalance, poor cooking habits, etc. can lead to calcium deficiency, toenails will also become white, and accompanied by the symptoms of softness. There may also be symptoms such as back pain, swollen joints, loose teeth, etc.; 3. Grey nails: Grey nails, also known as onychomycosis, are usually caused by dermatophyte infection of the nails of the hands or feet, which can lead to a whitening of the nail plate. As the disease progresses, the nail plate may also appear cloudy, thickening, separation, atrophy, shedding and other symptoms; 4, foot fungus: a fungal infection of the foot caused by the disease, can lead to toenail whitening, may be accompanied by itching, blisters, dry skin cracking and other symptoms; 5, chronic wasting disease: such as hypothyroidism, liver disease, malignant tumors, etc., may also lead to nail malnutrition, toenail The symptoms of turning white.