Anaphylactic purpura is harmful to the gastrointestinal tract, kidneys and bones and joints. 1. Gastrointestinal tract: The attack of purpura will cause nausea and vomiting, vomiting blood, abdominal pain and diarrhea, blood and mucus stools and other symptoms, abdominal pain is the most common manifestation, and even intestinal perforation, intussusception and other complications. 2. Kidney: purpura can cause kidney damage, causing purpura nephritis, clinical manifestations of hematuria, proteinuria and tubular urine, occasionally edema, hypertension and renal failure, repeated episodes can evolve into chronic nephritis or nephrotic syndrome, which has a certain impact on the human body. 3. Bone and joint: purpura can involve bone and joint, especially knee, ankle and elbow joints and other large joints, can develop into arthritis, clinical manifestations of joint swelling, pain and dysfunction. Henoch purpura has other harmful effects on the human body, should go to the hospital as soon as possible to receive treatment, reduce the impact of the disease on the organism, standardize the use of drugs under the guidance of the doctor.