The inner wall of the nail is not smooth may be physiological reasons, malnutrition, nail fungus and so on. 1. Physiological reasons: if you often do manicure, you will polish the nails thin, excessive stimulation of the nails, resulting in the inner wall of the nails is not smooth, this is a normal physiological phenomenon. 2. Malnutrition: If the usual long-term partiality and picky eating, weight loss, etc., may lead to a variety of trace elements, nutrients, lack of a long time on the growth of nails will have an impact on the growth of nails, the appearance of the inner wall of the nails is not smooth. 3. Ringworm of the nail: when patients suffer from ringworm of the nail, the fungus violates the nail plate, nail bed, resulting in nail lesions. Patients mainly manifested as nail plate deformation, thickening, discoloration, shedding, etc., and some patients will have the performance of the inner wall of the nail is not smooth. Patients appear nail wall not smooth exclude physiological reasons, should go to the hospital dermatology department in time, follow the doctor’s instructions for standardized diagnosis and treatment.