Joint pain in patients with purpura may be due to the relapse of purpura, but joint pain may also be due to osteophytes and osteoarthritis, etc., which need to be further diagnosed and treated according to the cause of the disease. 1.allergic purpura recurrence: patients with allergic purpura may recur after their condition improves, in most cases, the recurrence symptoms are less severe than the first attack, if the patient’s allergic purpura condition involves the blood vessels in the joint area, the patient may experience joint pain, can be targeted to be glucocorticoid, antihistamines (loratadine), immunosuppressant drugs (cyclophosphamide) and other medications to carry out the treatment. 2. Osteomalacia: Osteomalacia is one of the body’s self-protection mechanisms, which is a normal physiological phenomenon, and can be treated with non-steroidal anti-inflammatory drugs, such as meloxicam and celecoxib, for analgesic treatment, and surgical treatment can be used when the condition requires. 3. Osteoarthritis: Osteoarthritis is mainly characterized by joint pain, stiffness, swelling, etc. Osteoarthritis can be treated with NSAIDs (ibuprofen) and joint cavity injections, surgery and other methods. Patients with allergic purpura may have other reasons for joint pain after improvement, the above drugs need to be used under the guidance of a physician, and it is recommended that patients go to a regular hospital hematology, osteoarthritis to further clarify the diagnosis.