Black stool before your period: what to know

Menstrual blood can make it harder to judge whether dark material came from the vagina or bowel, but a period does not normally turn bowel movements black. Iron supplements sometimes taken for heavy periods, bismuth remedies, and dark foods can darken stool. Black, sticky, tar-like, strong-smelling stool may be melaena, caused by digested blood higher in the digestive tract. Gastritis, Helicobacter Pylori Infection, and Peptic Ulcer are possible causes, while the timing before a period may simply be coincidental. Note whether the dark material is mixed with stool or appears only on menstrual products.

Check the stool in good light and note whether it is formed, loose, sticky, or tar-like. Record any iron, bismuth, aspirin, or anti-inflammatory medicine and do not stop a prescribed medicine without advice. Arrange prompt medical assessment if the change is unexplained, repeats, or is accompanied by pain, dizziness, weakness, or vomiting. Keep hydrated and avoid alcohol while waiting for advice.

Go to emergency care for fainting, severe weakness, confusion, vomiting blood, coffee-ground vomit, severe abdominal pain, or heavy vaginal bleeding with light-headedness. Tell the clinician if pregnancy is possible, if you take a blood thinner, or if periods are unusually heavy, because these details change the urgency and assessment.

Ask whether the blood seems gastrointestinal or menstrual, whether you need blood tests, and whether iron or pain medicines could be contributing. Mention the first day of your period, the stool texture, recent food changes, stomach symptoms, and all supplements. Ask which symptoms require emergency help.