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It's OK if they're mild, but see your doctor if they're really bad.
Many teen girls and women get cramps for a few days when their period starts. You feel this as achy muscles below the belly button and sometimes in your low back.
That's a side effect of a hormone called prostaglandin.
Mild pain is no cause for worry. If your cramps are so strong that you double over in pain, call for a checkup. Your doctor may be able to treat painful periods that have a physical cause.
3: Am I Bleeding Too Much?
To tell if your flow is too heavy, count your pads or tampons. More than ten per day is too many. Soaking through an entire pad, every hour, for several hours in a row might be a problem. Same if your period lasts longer than seven days.
Check with your doctor to see if you need an office visit to deal with heavy flow.
It can seem like you change pads or tampons a lot. Yet the total blood lost is less than you may think. A woman normally produces about two tablespoons of menstrual fluid each cycle.
Your flow will likely be light at first, and heavier the second day. Then it tapers off as your period ends.