Usually blood loss plus chemistry: heavy flow depletes fluid and iron (period-related anemia is common - dizziness, fatigue, pallor are its cards), prostaglandins dilate vessels and drop blood pressure, and cramps suppress eating and drinking exactly when losses rise.
The fixes are mundane: fluids, salt, food, rising slowly. The real check: dizziness riding with heavy periods or fatigue earns a blood count and ferritin - iron deficiency is findable and very treatable. Urgent lines: actual fainting, dizziness with chest pain or palpitations, or soaking a pad an hour with weakness - same-day care.
What to do
Common questions
Why do I get dizzy on my period?
Several period-typical mechanisms stack. Blood loss: heavy flow depletes both fluid volume and iron - iron-deficiency anemia from heavy periods is common, and its calling cards are dizziness, fatigue, and looking pale. Prostaglandins: the chemicals that drive cramps also dilate blood vessels and can drop blood pressure - the stand-up-too-fast head rush intensifies. And the compounding habits: cramps suppress appetite, so eating and drinking drop exactly when fluid loss rises; pain and poor sleep add their own lightheadedness. The immediate fixes are mundane and effective: fluids, salt (blood pressure likes it here), food, and rising slowly. The check to actually get: if dizziness rides along with heavy periods (soaking pads, clots) or real fatigue, ask for a blood count and ferritin - iron deficiency is findable, confirmable, and very treatable, and treating it fixes the dizziness at the source. The urgent lines: actual fainting, dizziness with chest pain or palpitations, or soaking a pad an hour with weakness - that combination is same-day care. Pymander, a free AI doctor available 24/7 by text, can help you judge whether it is the iron pattern.