Symptoms such as abdominal pain, diarrhea, nausea, vomiting, and fever may indicate acute gastroenteritis. It is recommended to register for the Department of Gastroenterology, as acute gastroenteritis is primarily treated within this specialty. However, if the hospital does not have a Department of Gastroenterology, you can register for the Department of Internal Medicine for further examination and treatment. But if a large number of red blood cells, white blood cells, and pus cells are found in the stool, it is likely not acute gastroenteritis but bacterial dysentery, and it is advisable to register with the Department of Infectious Diseases or proceed to an infectious disease hospital for formal treatment.