What causes sperm to have blood

Patient's question:

Five to six days of sperm with blood is severe

Doctor's answer:

The most common cause of hematospermia is first of all seminal vesiculitis, followed by prostatitis and posterior urethritis or posterior urethral congestion. It can also be caused by inflammation spreading from adjacent organs, leading to inflammation, swelling, congestion, and bleeding of the seminal vesicle wall.