What causes congestion of foreskin blood vessels?

There are multiple blood channels inside the male penis. When the penis is erect, blood flows here and enters the corpus cavernosum, and the penis will enlarge and become extremely hard. When the sexual impulse ends, the blood will flow back and the penis will naturally become soft. However, why does the congestion of the foreskin blood vessels not subside for a long time? In fact, it is likely to be varicocele.

Causes of male infertility caused by varicocele:

1. Blood reflux brings substances produced by the adrenal glands and kidneys, such as steroids, 5-hydroxytryptamine, catecholamines, and prostaglandins, to the testicles. Prostaglandins reduce testicular blood circulation, increase epididymal contraction, are not conducive to sperm maturation, and affect sperm motility.

2. Reduced testosterone secretion, damage to testicular interstitial cells, peripheral blood testosterone levels also decreased, while blood follicle-stimulating hormone (FSH) and interstitial cell stimulating hormone (ICSH) increased, endocrine disorders, and even interference with the occurrence and maturation of sperm.

3. Blood stasis in the spermatic vein can cause the temperature in the scrotum to rise. If the temperature of the testicles continues to rise for a long time, it can affect the production of sperm in the testicles, leading to azoospermia and oligospermia.

4. Blood stasis, increased pressure in the spermatic vein, lack of oxygen and nutrients, affect the clearance of metabolic products, thereby affecting sperm development and maturation.