If the symptoms of stomach pain and diarrhea suddenly appear, the first thing to consider is that eating cold and irritating food or getting cold has caused gastrointestinal discomfort, which leads to stomach pain and diarrhea. If the pain and diarrhea symptoms are mild, you can apply hot compresses to the abdomen and drink some warm water to warm the stomach, which will in most cases relieve itself. If the symptoms do not improve or even worsen, it suggests that there may be a lesion, which requires prompt medical attention. The common diseases that cause stomach pain and diarrhea are the following: 1. digestive system diseases 1. acute gastroenteritis: often caused by improper diet, overeating or eating unclean food, may also be caused by bacterial infection. The onset of stomach pain, diarrhea, stools are mostly yellow or yellow-green, continue to develop can also appear nausea, vomiting, fever symptoms; 2, gastric ulcer: the onset of stomach pain, diarrhea symptoms, stools are mostly dark red or tar-like black stools, may also be accompanied by vomiting, bloating, belching, etc.; 3, other: such as chronic atrophic gastritis, post-gastrectomy, cholecystitis, pancreatitis, Crohn’s disease. pancreatitis, Crohn’s disease, etc., there may also be symptoms of stomach pain and diarrhea. Endocrine system 1, hyperthyroidism: because the thyroid gland itself produces too much thyroid hormone, gastric emptying and peristalsis are accelerated, causing malabsorption in the small intestine, which may lead to symptoms of stomach pain and diarrhea, accompanied by symptoms such as easy hunger, excessive sweating, fear of heat, and emaciation; 2, diabetes: diabetic patients may also have symptoms of stomach pain and diarrhea if they are infected by inflammation in daily life, which may be accompanied by weakness of the limbs and diarrhea. Also accompanied by weakness of the limbs, cold sweats, etc. In addition, if the patient himself has recently taken drugs, or improper diet caused acute poisoning, may also cause stomach pain, diarrhea. Therefore, once the above disease conditions occur, it is recommended that patients seek medical advice and follow the doctor’s instructions for symptomatic treatment, do not take medication without authorization, so as not to delay the condition.