Retroperitoneal fibrosis usually takes about three months to treat, depending on the individual’s physical condition and the severity of the disease. Retroperitoneal fibrosis is a serious, autoimmune disease resulting in fibroproliferative disease, the lesions may develop into the pelvis, abdominal cavity and other tissues, may cause pressure on the retroperitoneal cavity organs and obstruction, may appear weakness, nausea, vomiting, lower limb edema and other symptoms. You can take azathioprine, triamcinolone acetonide and other drugs under the guidance of the doctor for treatment, usually about a month can slowly recover, and gradually reduce the dosage in the later stage, at least need about three months. In addition, it is usually recommended to eat more high-protein high-fiber food, pay attention to a balanced diet, do not eat spicy stimulation greasy food, eat more fresh fruits and vegetables, to maintain a smooth bowel movement. Appearance of retroperitoneal fibrosis, need to go to the hospital in time.