What triggers your period to stop?
Short answer: Your period stops when hormonal changes after the initial shedding of the uterine lining trigger blood vessel constriction, clotting and tissue repair in the endometrium. Longer-term cessation can also be caused by pregnancy, breastfeeding, hormonal contraception, menopause, significant weight or stress changes, or medical conditions.
Explanation
Menstruation begins when the corpus luteum fails to sustain progesterone and the functional layer of the endometrium is shed. Bleeding continues until local haemostatic processes and endometrial repair end the loss of blood: spiral arteries constrict, platelets and clotting factors limit bleeding, and epithelial cells begin re-growing to reseal the surface. As the cycle progresses, rising estrogen and progesterone from a new follicular phase (after ovulation in a normal cycle) promote repair and rebuilding of the lining, ending menstrual flow. If pregnancy occurs, hCG maintains progesterone and prevents the shedding; prolonged absence of menses (amenorrhea) can also reflect lactational physiology, exogenous hormones (e.g., hormonal IUDs, oral contraceptives), ovarian failure (menopause), significant energy deficit, thyroid or pituitary disorders, or other medical causes.
Tips
- If bleeding is very heavy (soaking a pad/tampon hourly) or lasts more than 7 days, seek medical attention.
- Missed periods for three months or more (if not pregnant) warrant evaluation for hormonal, thyroid, or reproductive issues.
- Contraceptives and breastfeeding commonly alter bleeding patterns; discuss expectations with a clinician.
- Maintaining a healthy weight, managing stress, and treating underlying medical conditions can help normalize cycles.
- Menopause is the natural permanent end of periods when ovarian follicles are depleted and estrogen/progesterone fall chronically.
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