Kidney damage caused by allergic purpura is called allergic purpura nephritis. The main clinical manifestations include joint pain, rash, black stools, abdominal pain, as well as hematuria, increased urinary protein, elevated blood pressure, and even edema and renal insufficiency. During the acute phase of allergic purpura nephritis, patients should rest in bed, and if there is edema, intake of water and salt should be strictly restricted. It is also important to actively identify the allergens to conduct etiological treatment. Intake of certain suspected foods or medications should be prohibited. If the patient has obvious rashes and joint pain, antiallergic medications can be used for treatment. If the effect is not satisfactory, hormones and immunosuppressive agents can be introduced. Depending on the patient's condition, Traditional Chinese Medicine can also be used to invigorate blood circulation and remove blood stasis. If the condition is severe, combined treatment can be considered for better results.