Immunocompromised patients can go to hematology, nutrition, gastroenterology and other departments according to specific symptoms, medical history, signs and other factors. 1. Hematology: Immunocompromised patients with skin ecchymosis, tinnitus, pale skin and mucous membranes, memory loss, recurrent gastrointestinal bleeding, bleeding gums, and recurrent viral or bacterial infections should consult the hematology department. 2. Nutrition: immunocompromised patients with symptoms such as emaciation, low BMI, unresponsiveness, edema, etc., as well as patients with poor dietary habits, irregular eating, picky eating, etc., should go to the Department of Nutrition for consultation. 3. Gastroenterology: Patients with a history of chronic peptic ulcer, chronic diarrhea, etc. may have lowered immunity due to digestive tract dysfunction, and should be referred to the Gastroenterology Department. There may also be other reasons for low immunity, so patients are advised to go to regular hospitals for detailed consultation and choose the appropriate department for consultation.