Allergic purpura nephritis has many symptoms, the more common ones are skin rash, joint pain and gastrointestinal symptoms. 1. Rash: It is more common in the early stage, which is mainly manifested as hemorrhagic spots on the skin, which do not fade away when pressed, and usually involves the buttocks, trunk and limbs. 2. Arthralgia: mainly manifested as joint pain, preferably occurring in the foot and knee joints, the location of the pain is relatively fixed. 3. Gastrointestinal symptoms: when purpura fulminans nephritis is aggravated and involves gastrointestinal tissues, it may cause gastrointestinal symptoms, such as abdominal pain, diarrhea, nausea, vomiting and loss of appetite. Some patients with purpura fulminans nephritis may also exhibit nephrotic syndrome, with symptoms such as massive proteinuria and hypoproteinemia. It is recommended that patients with purpura nephritis go to regular hospitals and follow the doctor’s instructions for standardized treatment.