The cause of uneven nails is mainly nail dystrophy, but can not be ruled out nail fungus, lichen planus, psoriasis and other diseases. The specific cause of the disease needs to be confirmed after examination in the dermatology department of the regular hospital. 1. Nail malnutrition: due to the lack of micronutrients and nutrients in the body for the development of nails, which leads to the formation of nail plate obstacles, the nail plate will appear a variety of shapes and textures of abnormalities. The body may show symptoms of uneven nails. Clinical symptoms also include thinning, thickening and brittle nails. 2. Onychomycosis: After invading the nail plate, the fungus releases various enzymes that decompose the nail plate and destroys the nail plate, resulting in nail lesions, and the body may show symptoms of uneven nails. 3. lichen planus: under the combined effect of immunity, infection, mental and psychological factors, endocrine disorders, metabolic abnormalities, drugs and other factors, resulting in lichen planus, if it violates the nails, the symptoms of uneven nails may appear. 4. Psoriasis: Inflammatory diseases caused by heredity, environment, infection and other factors, when involving the nails, it will also lead to uneven nails with thimble-like symptoms. If the symptoms of uneven nails appear, it is recommended to go to the hospital in time, with the help of the doctor to clarify the cause of the disease, and to carry out targeted treatment or therapy.