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. **Menstruation**
**Definition**
Menstruation is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. [[2]] It is a natural part of a healthy monthly cycle for people with a uterus and ovaries. [[1]]
**Process**
Every month, the body prepares for pregnancy. If no pregnancy occurs, the uterus, or womb, sheds its lining. [[3]] The menstrual blood is partly blood and partly tissue from inside the uterus. [[3]] It passes out of the body through the vagina. [[1]]
**Menstrual Cycle**
Menstruation is part of a monthly cycle that is characterized by the rise and fall of hormones. [[2]] The average menstrual cycle lasts for 28 days, but it can vary from 21 to 35 days. [[3]]
**Other Names**
Menstruation is also known as a period, among other colloquial terms. [[2]]
**Lower Gastrointestinal Hemorrhage (LGIH)**
**LGIH** is bleeding that occurs in the lower gastrointestinal tract, which includes the colon and rectum.