Common causes of upward pointing nails include: onychomycosis, external pressure, malnutrition, and iron deficiency anemia. 1. Ringworm of the nails: usually due to fungal infection or improper manicure, etc., its symptoms can be manifested as the unevenness of the nail surface, nail plate warping, nails become brittle and so on. It is recommended to go to public places, do their own protection, and repair nails diligently on a daily basis. 2. External force extrusion: it can also lead to nail deformation and upturning, and mild external force extrusion can often be recovered. If the nail bed is damaged, you should go to the hospital for treatment as soon as possible. 3. Malnutrition: usually due to poor diet and gastrointestinal indigestion, it can be manifested as thinning of the nail plate, upturning of the nail and lack of luster. Usually pay attention to strengthen physical exercise, eat more fresh fruits and vegetables. 4. Iron deficiency anemia: due to the body’s reduced iron intake and iron loss caused by excessive, usually manifested as a lack of glossy nails, concave under the anti-nail, brittle and easy to break and other symptoms. Can follow the doctor’s instructions oral dextrose iron oral solution for drug treatment, usually cut the nails diligently, to avoid upturned nails. To summarize, it is recommended that the phenomenon of upward-pointing nails, timely medical treatment, and follow the doctor’s instructions for symptomatic treatment.