Bulging fingernails may be related to trauma, infection, malnutrition, lack of micronutrients and other factors. 1. Trauma: Nails are squeezed or impacted, often causing them to bulge upward. 2. Infection: Fungal infections tend to cause thickening of the nail plate or buckling and unevenness, resulting in bulging nails. 3. Malnutrition: There is a relationship with nail malnutrition. Most of them are caused by skin diseases or hereditary factors that cause thickening or deformation, so the nails are easy to bulge. 4. Lack of micronutrients: often picky or partial food, resulting in micronutrient deficiency, may appear the phenomenon of bulging nails. Fingernails bulging may have other reasons, it is recommended to go to the hospital in a timely manner to improve the relevant examination to clarify the cause of the disease, to give targeted treatment to avoid delays in the condition.