What color is sperm?
Jun 12, 2022
Source: Cainiu Health
Dr. Luo Yong
Introduction
Semen color is determined by its constituent components. Normal semen appears grayish-white or milky-white and is opaque. A pale yellow hue may occur after a prolonged period without ejaculation, resulting in slight color variation and increased viscosity—this is considered normal. However, if a male has an infection in the reproductive tract, semen may appear yellow due to purulent infection of the prostate and seminal vesicles.
The color of semen is determined by its constituent components.
Normal semen appears grayish-white or milky-white and opaque. Freshly ejaculated semen has a viscous, jelly-like consistency and typically begins to liquefy within 5 minutes—this process is known as semen liquefaction—and is usually complete within 15–30 minutes.
A pale yellow hue may occur after prolonged abstinence, resulting in slight color variation and increased viscosity—this is considered normal. However, yellow semen may also indicate inflammation of the male reproductive tract; under microscopic examination, numerous pus cells may be observed, strongly suggesting purulent infection of the prostate or seminal vesicles.
If semen appears red or light red—or occasionally brownish-red or soy-sauce-colored—and microscopic examination reveals numerous red blood cells, this condition is commonly referred to as “hematospermia” (blood in semen). Hematospermia most frequently results from seminal vesiculitis or prostatitis. In addition to bleeding, some individuals may experience associated pain.
Occasionally, vigorous or overly forceful sexual activity may cause minor trauma and capillary rupture in the genital organs, leading to transient hematospermia—a benign, self-limiting physiological phenomenon that resolves spontaneously.
