Common causes of kidney bleeding include inflammation, urinary stones, tumor, trauma, etc. Mild cases can recover in 2 weeks to 2 months, while severe cases will take longer time, usually ranging from several months to several years, and severe cases will even have bleeding for a long time. 1. Inflammation: If the bleeding is caused by pyelonephritis, acute glomerulonephritis, etc., the less severe cases can recover in about 2 weeks to 2 months after active standardized treatment; if there is no improvement in more than 2 months, it is necessary to consider whether there are other complications or other chronic diseases. 2. Urinary stones: if the kidney stones, if the stones are small after active standardized treatment, generally 2 weeks ~ 2 months or so can be fully recovered. If the stones are large and cause serious symptoms of kidney bleeding, the treatment time is longer and can last from several months to several years. 3. Trauma: If kidney contusion or closed trauma causes kidney bleeding, the condition will usually improve in a short period of time, and the patient can recover in 2 weeks to 2 months. If kidney bleeding is serious, rupture, hemorrhage, etc., kidney surgery is needed, and its recovery time will be prolonged accordingly. 4. Tumor: Kidney tumor is mostly malignant, which usually causes more serious symptoms, and there is no specific data on its recovery time, which may take years or even longer, and in serious cases, there will be bleeding for a long time. It is suggested that patients with renal bleeding should consult doctor in time and follow the doctor’s instruction to regulate the treatment in order to promote the recovery of the disease.