If it is mild hydronephrosis, patients usually do not have obvious clinical symptoms; if it is moderate to severe hydronephrosis, patients mainly experience discomfort and pain in the lower back, and may even have abdominal distension. Once hydronephrosis is complicated by bacterial infection, symptoms may include chills, fever, frequent urination, urgent urination, and general muscle soreness, etc. If there is long-term and extensive hydronephrosis, it can lead to chronic obstructive kidney disease, with symptoms including reduced urine output, swelling of the lower limbs, general fatigue, poor appetite, and increased blood pressure. Patients may experience dizziness, anemia, and decreased kidney function. Therefore, attention must be paid to hydronephrosis. In cases of mild hydronephrosis, the main approach is follow-up and observation. If the hydronephrosis is severe, kidney function tests are required, and surgical drainage should be performed to treat the hydronephrosis.