Vasocongestion

Typical causes of vasocongestion in humans includes menstruation, sexual arousal, REM sleep, strong emotions, illnesses, deep venous thrombosis (DVT) and allergic reactions.

Although pain and discomfort varies among individuals, vasocongestion is an essential part of the shedding of the lining of the uterus.

The illness of rosacea is a chronic vasocongestion condition of the face that primarily affects the cheeks and nose, but may include other areas such as the eyes and chin.

[medical citation needed] Vasocongestion is essential for sexual procreation in mammals since this is the force that causes the hardening of a penis during an erection.

Other forms of vasocongestion during human sexual activity include sex flush and the swelling of nipples in both men and women.