Hematospermia is a less common disease of the male reproductive system, manifested as blood in the semen, and there is no need to be overly alarmed when it happens, because hematospermia is not a harbinger of any disaster, and the vast majority of patients with hematospermia are not caused by any major disease, but it should not be treated as a child’s play, because hematospermia may also be caused by some serious diseases. Hematosperm attack, semen from the normal gray-white suddenly turned reddish-brown, pink or mixed with blood, of course, is mixed into the blood caused by the color change depends on the bleeding time of the morning and evening, if it is fresh bleeding, semen color can be bright red, bleeding more when the whole part of the semen will be completely bloody, and the formation of clots; if the interval between the discharge of semen is too long, the blood is accumulated in the spermatogonium for a long time, the blood of iron after oxidation is rusty, and the blood will be oxidized. If there is too much time between ejaculations, the blood will accumulate in the seminal vesicles for a long time, and the iron in the blood will be oxidized and become rusty; if the amount of bleeding is small and the seminal vesicles bleed unilaterally, the semen may be mixed with only a few blood threads; if there are repeated bloody ejaculations for a long period of time, the large amount of blood clots deposited in the seminal vesicles will be mechanized, and stones will be formed. So where does the blood in the semen come from? It’s just a lesion in some part of the sperm’s pathway, such as bleeding, inflammation, or even a tumor. Because the composition of semen in addition to the volume of sperm, the vast majority of the sperm is called seminal plasma liquid components, these fluids 60% -80% from the seminal vesicle glands, 20% -25% from the prostate gland. However, the prostate gland is a hard solid tissue, not easy to bleed, while the seminal vesicle glands are cystic, the wall is very thin, once the inflammation is congested, it is easy to bleed. Therefore, the most common cause of hematospermia is seminal vesiculitis, which can also be caused by inflammation of neighboring organs spreading to the seminal vesicles, which causes inflammation, swelling, congestion and bleeding of the walls of the seminal vesicles. Bleeding due to inflammation mostly comes and goes but does not last long, while if it is accompanied by blood clots or stone formation, it will block the passage from the seminal vesicles to the urethra, thus making the inflammation recurring, which is not easy to be completely eliminated, and turning into persistent hematospermia. Patients who also have a tendency to bleed extensively throughout the body are likely to be the result of systemic hemorrhagic disorders, such as hemophilia, thrombocytopenia, and so on. Sometimes, patients with high blood pressure also experience hematospermia. Overseas studies have found that prostate cancer patients are prone to hematospermia, so it is recommended that men over 40 years of age should be screened for prostate cancer if they develop hematospermia. Therefore, we should not be overly nervous about hematospermia, nor should we take it lightly, because it may also be a sign of some serious diseases, and it is best to find a specialist for serious examination.