Blood in the ejaculate is called hematospermia, which is mainly caused by seminal vesicle inflammation, seminal vesicle stones, prostate tumors, etc. The most common cause of hematospermia is congestion and edema of the seminal vesicles. 1. The most common cause of hematospermia is congestion and edema after inflammation of the seminal vesicle glands, and strong contraction of the seminal vesiculitis during ejaculation, which causes capillary rupture and hemorrhage, and the blood is mixed into the semen to form hematospermia. 2. Seminal vesicle stones: Seminal vesicle stones are also a common cause of hematospermia, mainly because the presence of stones can easily induce inflammation, and the movement of stones can also damage the seminal vesicle glands, thus inducing bleeding. 3. prostate cancer: patients with prostate tumors can also experience hematospermia when the tumor blood vessels rupture during ejaculation. Overall, patients with hematospermia need to pay attention, go to the hospital in time for examination, and carry out targeted treatment after clarifying the cause of the disease.