Blood sperm is seen in the following diseases: 1, there may be inflammation of the seminal vesicles. Inflammation of the seminal vesicles is usually caused by retrograde infection, the appearance of seminal vesicle inflammation, you can take appropriate antibacterial drugs for treatment, you can also take antibiotic drugs for treatment. 2, may be the case of blood vessel rupture, this situation is mostly in puberty the incidence is relatively high, because at this time of libido is more vigorous, easy to appear genital congestion, edema phenomenon, there will be rupture of the blood vessels. . In addition to the above two diseases can cause blood menstruation, we should also consider whether there are symptoms of seminal vesicle polyps or seminal vesicle stones. It can be seen that a variety of diseases can cause the symptoms of hematochezia, the more serious condition is best to go to the hospital in time to do ultrasound examination of the seminal vesicles, to determine the cause of the disease after targeted treatment.