If you find that a little semen would identify the cause. Which in part caused by atherosclerosis, knitted bags testicle area. This disease curable by surgery, but if other causes by semen, requires further medical treatment.
If found to have low sperm must find the cause. Some of which is caused by varicose veins in the scrotum. The disease is curable with surgery. But if the semen less by other causes. It requires drug therapy further.
If found to have less semen to find the cause. Some of which caused by the brown trout the scrotum. This disease treated by surgery. But if the semen is small by other causes. Also need medical help.