Uneven toenails are considered to be related to external force, fungal infection, nutritional element deficiency, psoriasis and other reasons. 1. External force: toenails are damaged by external force, such as smashing or squeezing, which may cause unevenness. 2. Fungal infection: often wearing impermeable shoes and sweating more on the feet can easily induce fungal infection and cause onychomycosis, which can lead to discoloration and thickening of toenails and unevenness of nail surface. 3. Nutritional element lack: daily diet structure is unreasonable, vitamin, trace element lack, can’t provide nutrients for nails, which affects the growth of nails, and can lead to the lack of luster of nails, uneven surface of nails. 4. Psoriasis: Psoriasis may invade the nails, resulting in damage to the nails, which may cause small pit-like changes on the nails. It is recommended that the patient go to the hospital in time to clarify the cause and follow the doctor’s instructions to standardize the treatment, which can promote the recovery.