If a man has pain in the lower part of the stomach, if there is an obvious history of unclean eating or overeating, eating cold food, etc., and the pain is accompanied by nausea, vomiting, diarrhea and other symptoms, the possibility of acute gastroenteritis is considered to be higher. If the pain is accompanied by symptoms such as frequent urination, urinary urgency and painful urination, the possibility of acute cystitis is considered. If the pain in the lower abdomen appears after strenuous exercise and there is hematuria in the naked eye, consider the possibility of ureteral calculi. If there is discomfort in the penis and testicular area, it is also important to consider whether it is related to male diseases, such as varicocele. It is also important to consider the possibility of intestinal obstruction, usually with symptoms such as vomiting and the cessation of defecation and exhaustion. In order to clarify the specific cause, it is recommended to seek timely medical attention and treatment.