Causes of mouth ulcers in men may be related to genetic, immunologic, psychiatric, dietary and traumatic factors. 1. Genetic factors: Mouth ulcers are closely related to family genetic history. 2. Immune factors: the decline of immunity will make the body vulnerable to pathogens, which will lead to the occurrence of mouth ulcers; at the same time, in the process of immune response also consumes immune proteins, which breaks the immune balance of the mouth, accelerating the occurrence of mouth ulcers. 3. Mental factors: when men are mentally stressed, it is easy to produce tension, irritability, and anxiety and other negative emotions, resulting in poor sleep quality, the body’s immune function decreases, suffering from viral infections, triggering mouth ulcers. 4. Dietary factors: partial eclipse leads to unbalanced intake of vitamins, trace elements and other nutrients in the human body, which leads to mouth ulcers. For example, zinc is an important component of many enzymes in the human body, which can affect the cell division and regeneration, reduce the synthesis of digestive mucus proteins of the oral mucosa, leading to the peeling of the oral mucosa layer caused by the disease. 5. Traumatic factors: physical injury is the most common, such as eating sharp things will cause scratches or abrasion, their own teeth accidentally bite, wear orthodontic braces, toothbrush scratches, etc., are prone to cause damage to the oral mucosa caused by oral ulcers. It is recommended to consult a doctor to clarify the cause of the disease and then treat it.