If mild hydronephrosis is caused by physiological factors such as pregnancy, it can usually be cured by itself; however, for hydronephrosis caused by pathological reasons such as urinary tract infection and urinary stones, it is usually difficult to be cured by itself. 1. Physiological factors: some women may have mild hydronephrosis during pregnancy, mainly due to the enlargement of the uterus, resulting in the narrowing of the connection between the bladder and the kidneys, and the symptoms will usually disappear on their own after the end of the pregnancy, without special treatment. 2. Urinary tract infections: for example, cystitis, urethritis, etc. The hydronephrosis caused by this kind of disease is difficult to be cured on its own, and if some patients are not treated in time, it is easy to develop into chronic urethritis and chronic cystitis, which makes it more difficult to be treated. 3. Urinary stones: such as bladder stones, urethral stones, renal pelvis stones, etc., this kind of disease caused by hydronephrosis is difficult to self-cure, especially for patients with large stones, can be extracorporeal lithotripsy or surgical lithotripsy treatment. If you have mild hydronephrosis, you should pay attention to it and actively seek medical treatment, and take regular treatment after analyzing the cause of the disease under the guidance of doctors, so as to avoid delaying the condition, which will lead to an increase in the amount of hydronephrosis and affect the renal function.