Diarrhea can be caused by many causes in daily life, including bacterial and viral infections, unhygienic diet, allergies, adverse drug reactions and poisoning. There are many reasons for diarrhea, so which department should we go to the hospital to register for diarrhea? 1.According to the age, those who are under 18 years old should be registered with pediatrics, because children are still growing and developing, their medication is different from that of adults, so they should be registered with pediatrics first, and then they can be registered with gastroenterology to assist in the treatment. 2.Diarrhea related to indigestion or gastroenteritis, or chronic diarrhea can be seen in gastroenterology 3.If diarrhea is accompanied by abdominal pain and blood in the stool, consider going to the hospital gastroenterology or anorectology. 4.If diarrhea is accompanied by severe abdominal pain, abdominal pain should be the first problem to be solved. There are many causes of diarrhea, so it is recommended that patients first make a self-diagnosis and go to the relevant departments according to their own situation, and there is no need to worry if the situation is not urgent, as the hospital has a pre-screening triage nurse who will guide you to register.