Sperm brown and watery is considered to be caused by hematospermia, which is mainly related to inflammatory infections, stones, vascular abnormalities, tumors and other pathological factors. 1. Inflammatory infections: such as seminal vesiculitis and other diseases, due to disease-causing bacteria and other microorganisms on the seminal vesicle mucous membrane cells produce stimulation, will cause the mucous membrane of redness, swelling, bleeding, so as to produce hematospermia. 2. Stones: such as prostate stones, seminal vesicle stones, etc., may cause smooth muscle contraction during sexual intercourse, resulting in stone activity, which may cause small blood vessels to bleed, resulting in hematospermia. 3. Vascular abnormality: when the seminal vesicles as well as the arterial and venous blood vessels of the prostate gland are malformed, it may cause hematospermia. 4. Tumor: if the seminal vesicle is invaded by cystadenoma, posterior urethral adenoma, prostate cancer, etc., it can cause hematospermia. When the above symptoms appear, it is recommended to consult the doctor in time, improve the ultrasound of seminal vesicles, semen culture and other tests, and then treat the cause of the disease to avoid delaying the condition.