If you need to change your tampon or pad after less than 2 hours or you pass clots the size of a quarter or larger, that is heavy bleeding. If you have this type of bleeding, you should see a doctor. Untreated heavy or prolonged bleeding can stop you from living your life to the fullest.

How much blood is abnormal during period?

Most women will lose less than 16 teaspoons of blood (80ml) during their period, with the average being around 6 to 8 teaspoons. Heavy menstrual bleeding is defined as losing 80ml or more in each period, having periods that last longer than 7 days, or both. But it's not usually necessary to measure blood loss.

When should you worry about abnormal bleeding?

When should you see a doctor about abnormal bleeding? "You need to see a doctor if you don't have a monthly period or have more than one period per month. Feeling lightheaded or dizzy when you stand is also concerning," says Dr. Schrop.