Blood in the urine and seminal fluid
Hematuria or blood in the urine starts as a late development of prostate cancer. The urine starts looking pink, brownish and even red, but sometimes it is not perceived by the naked eye, and only a lab exam would be able to detect this alteration. It typically appears because the tumor is pressing structures of the urinary tract, including the urinary bladder, the urethra and even the ureters. Sometimes, it is also a side effect of the therapy to fight cancer.
Blood in the semen is called hematospermia, and it can be caused by an injury in any part of the male reproductive system including the testicles and the prostate. In prostate cancer, it can be the result of new blood vessel formation by the tumor. These new blood vessels are fragile and prone to bleeding. However, it may be also caused by radiotherapy and other options to fight cancer.
In any case, if you are younger than 40 years old and find blood in your semen once, it is likely to be an isolated event, but if you’re over 40 years old or continually have this symptom, you need to ask your doctor to investigate the cause.