Low semen volume may be related to age, frequent sex life and other physiological reasons, but also may be related to seminal vesiculitis, orchitis, seminal vesicle hypoplasia and other pathological reasons. 1. Physiological reasons: male sperms are produced by testes, when age, the physiological function of testes is weakened, resulting in a decrease in the amount of sperms produced; too frequent sex life can also cause a decrease in the amount of sperms, which is a physiological phenomenon, and does not need to be treated. 2. Pathological causes (1) Spermatitis: it may be related to gonococcus, Candida albicans, Trichomonas vaginalis and other infections, which may cause obstruction of sperm discharge due to inflammation and low semen volume. (2) Testiculitis: it can be related to pathogens such as Escherichia coli, Staphylococcus aureus, parotid virus, etc. Due to inflammatory stimulation, it can lead to redness and swelling of the testicular area, which can cause obstruction of sperm discharge and low semen volume. (3) Seminal vesicle hypoplasia: it can lead to reduced semen production and the above symptoms. When chronic semen volume becomes low for a long period of time, the cause needs to be clarified in time under the guidance of a doctor and actively treated.