Summer stomach pain and diarrhea is considered to be caused by physiological factors such as unclean diet, overeating, etc. It may also be caused by diseases such as irritable bowel syndrome, acute gastroenteritis, etc. It should be clearly diagnosed, and should be handled by choosing general measures, loperamide, norfloxacin, omeprazole and other medications. 1. Physiological factors: in the summer food left for too long is easy to deteriorate, if the intake of unclean diet or overeating, may cause stomach pain, diarrhea. If the symptoms are mild, there is no need for special treatment, drink more water and use hot water bags to apply hot compresses to the abdomen. 2. Irritable Bowel Syndrome: If you suffer from irritable bowel syndrome, the patient will experience stomach pain and diarrhea. Should follow the doctor’s instructions to take scopolamine, ortizinium bromide and other antispasmodic agents to relieve pain, combined with loperamide and other antidiarrheal drugs to improve symptoms. 3. Acute gastroenteritis: acute gastroenteritis can cause stomach pain and diarrhea, if the bacterial infection caused by the need to take the use of norfloxacin and other antibiotics for antibacterial infection treatment. There are many reasons for stomach pain and diarrhea in summer, so it is recommended that patients consult a doctor for a clear diagnosis.