Clinically, HIV infection can be divided into acute phase, asymptomatic phase, and AIDS phase. The clinical symptoms of AIDS patients are complex and variable. Invasion of the gastrointestinal tract can cause diarrhea symptoms, which generally occur in the acute phase and the AIDS phase.1. Acute phase: usually caused by massive replication of the virus after infection, usually occurs 2-4 weeks after the virus invades the body, and may be accompanied by fever, chills, nausea, vomiting and other manifestations. The number of diarrhea can be up to a dozen times, the stool is thin and watery or unshaped; 2. AIDS stage: mainly manifested as long-term chronic diarrhea, which usually lasts for weeks or months, causing more causes of diarrhea and more complex symptoms. The combination of tumors may also cause diarrhea, which may be accompanied by abdominal discomfort, abdominal pain, and blood in the stool. Patients may suffer from weight loss due to persistent diarrhea, as well as swollen lymph nodes and other infections. It is recommended to pay attention to the diet and minimize the consumption of foods with high fat content, and limit the fat intake to 40g per day to avoid aggravating diarrhea.