Menstrual fluid is a combination of blood, cervical mucus, and uterine lining that is expelled from the body during a woman's menstrual cycle. This process typically occurs once a month and is a natural part of reproductive health. The fluid can vary in color, consistency, and volume, depending on individual factors such as hormonal changes and overall health. The menstrual cycle is regulated by hormones like estrogen and progesterone, which prepare the body for potential pregnancy. If fertilization does not occur, the lining of the uterus sheds, resulting in menstrual fluid. Understanding this process is important for women's health and can help in recognizing any irregularities.