The odor of semen is usually described medically as a chestnut flower-like odor, but many people have never seen chestnut flowers. If described with familiar substances, the odor of semen is somewhat like the fishy smell of dirt and the fishy smell of seawater, both of which are present, and the odor of semen is compatible with the color, for example, normal semen is light white or light yellow. If the odor of semen changes, it is usually pathological and the color will also change. In septic inflammatory diseases such as prostatitis, vesiculitis and epididymitis, the odor of semen will be fishy and yellowish, or even blood-colored, which is a unique characteristic of septic diseases. If a person eats too much spicy, fried or greasy food, the smell of semen will be too fishy, too heavy, and the color will deepen. However, if a person is in the process of losing weight or eating too light a diet without nutrition, the odor of semen will diminish or even have no odor, which are abnormal manifestations, so the odor of semen is closely related to the health of the human body.