Hi.
The blood in the semen may mean any problem along with the tract (hence, it may have come from the kidney, the ureter/connecting tubes to the bladder, the urinary bladder, the prostate due to enlargement from age-related causes or infection or cancer, then there is the urethra- the final tube that runs along the penis). Causes would range from kidney stones, infection, a problem with blood coagulation, and malignancy. It would be best to see a doctor soon to have yourself evaluated straightaway.
i experienced this syptom, It is due to congestion and chronic iflaminations in ur prostate and my Doc prescribed me Remycin 100 twice a day for 2 weeks