A horizontal bump in the middle of the nail is considered to be nail plate injury, fungal infection or nail dystrophy. If the nail plate is infected by fungus, it may cause unevenness or horizontal bump, and it is recommended to take oral antifungal medication, such as terbinafine capsule, itraconazole capsule, etc., as prescribed by the doctor. If the nail plate trauma can lead to irregular nail production, there is a possibility of transverse convexity. Nail malnutrition, especially calcium and zinc deficiency, may lead to uneven nail plate, this situation is recommended to supplement the trace elements, this nail malnutrition may also be gastrointestinal absorption problems, some long-term chronic gastroenteritis, can lead to the absorption of certain nutrients is insufficient, which led to the nail malnutrition, this situation should be to treat the primary disease, the treatment of chronic gastroenteritis. It is recommended to consult a doctor and receive regular hospital treatment under the guidance of a doctor.