The main diseases that can lead to hydronephrosis include the following: 1. pulmonary tuberculosis, usually in adolescents, mostly accompanied by low fever, fatigue, night sweats, wasting and other symptoms of tuberculosis poisoning, if the patient’s sputum is found in the antacid bacilli, the diagnosis of active tuberculosis can be confirmed, after the diagnosis requires the use of anti-tuberculosis drugs for treatment, such as isoniazid, rifampin, pyrazinamide, etc. 2, Pulmonary tumor, which usually occurs in the elderly, usually has a long history of smoking, and also has clinical manifestations such as chest pain, fever, coughing up blood, dyspnea, wasting, etc. The lung CT will show a mass shadow, and after bronchoscopy or puncture biopsy, a clear diagnosis can be made, and after diagnosis, surgery, radiotherapy, chemotherapy, etc. should be considered according to the condition.