Nail thickening causes more, physiological nail thickening is mostly seen in the elderly, disease caused by nail thickening seen in onychomycosis, nail dystrophy, long in the finger chronic skin disease. 1. The elderly due to the metabolic rate slows down, keratinocyte accumulation so the nails will be thicker, but on the aesthetic impact is small, usually do not have to treat. 2. Ringworm of the nail is caused by fungal infection, usually the fungus on the fingertips spread to the nail underneath, there is a certain degree of contagious. In addition to thickening of the nails, patients with onychomycosis also have symptoms such as deformation of the nails, brittleness, loss of luster, and accumulation of debris under the nails. 3. Nail dystrophy is usually caused by trauma to the nails, exposure to chemicals or lack of calcium, zinc, vitamin B and other nutrients, and can usually recover on its own after removing the cause. 4. Some of the chronic skin diseases on the fingers, such as eczema, lichen planus, etc., due to long-term inflammation and repeated stimulation of the nail mother, resulting in thickening and deformation of the nails. The phenomenon of thickened nails will also improve after the primary disease is cured. There may be other reasons why the thickening of nails does not recover in the long run, so you need to go to the hospital in time to clarify the cause of the disease before treatment.