The hydronephrosis of 16mm belongs to mild hydronephrosis and this condition is not serious. Hydronephrosis is usually caused by some obstructive diseases, such as kidney stones or ureteral stones, etc. If the hydronephrosis is only 16mm, it is considered that the obstruction is not serious or serious obstruction in the early stage, which only needs to lift the factors causing obstruction in time, and usually do not need to carry out other treatments, and the hydronephrosis will subside by itself, and it will not have too serious impact on the patient’s health, but if the patient is not treated in time, it will lead to more serious hydronephrosis, and may even lead to the loss of the whole kidney function. However, if the patient’s hydronephrosis is not treated in time, the hydronephrosis will become more serious and may even lead to the loss of the whole kidney function. From the above, it can be seen that 16mm hydronephrosis is not serious, but it needs to be treated in time, otherwise, if the disease continues to progress, it will cause serious harm to the patient’s health.