In most cases, hospitalization is required for the treatment of hydronephrosis, especially when it is first discovered. Hospitalization is primarily for assessing the severity of the patient's condition, identifying the cause of the condition, and determining the treatment plan. These are the main purposes of hospitalization. If the patient needs the aforementioned objectives to be met, it often requires surgery or hospital treatment. Therefore, patients with hydronephrosis need to identify the cause, which is often related to issues in the urinary system such as stones, tumors, or prostate enlargement. More complex examinations may be needed, and surgical treatment may be necessary, all of which need to be completed under hospitalization conditions. However, if the patient only has prostate enlargement and does not require surgery, placing a urinary catheter can resolve the issue, and such minor cases might also be handled on an outpatient basis.