Normal Period

Medically Reviewed by Melinda Ratini, MS, DO on March 06, 2024
3 min read

A normal period (or normal menstruation) is different for every woman. Each month, one of your ovaries releases an egg. Meanwhile, your uterus gets ready to help your baby grow if that egg gets fertilized. If it does, you’re pregnant. If it doesn’t, your body sheds the lining of your uterus through your vagina. That’s your period. It happens, on average, every 28 days.

Think about how old you were when you got your first period. Now think about how old you may be when you enter menopause. Your body and life will change a lot from one to the other, right? So does your menstrual cycle.

When it comes to periods, "normal" covers a lot of ground. Use the broad range of factors below as a guide. And remember: The only true normal is what's normal for you.

Every month, your entire body prepares to get pregnant. Your ovaries release an egg. Hormones rise and fall.

This is your menstrual cycle. It starts on the first day of your last period and ends on the first day of your next period. Though the average cycle is 28 days long, anything between 21 and 45 days is considered normal. That's a 24-day difference.

For the first year or two after menstruation begins, women tend to have longer cycles that don't start at the same time every month. Older women often have shorter, more consistent cycles.

If you're on birth control pills or have an IUD, it can change the timing of your period. Ask your doctor what's normal for your form of contraception.

How long your period lasts also varies. The time from the first sign of blood to the last is usually in the 3-to-5-day range. Any length from 2 days to a week is normal for a period.

If the egg your ovary releases every month isn't fertilized, the lining of your uterus sheds through your vagina. This is your period. The amount of blood that comes out of your body is called your menstrual flow.

Whether your flow is light, moderate, or heavy, it can all be considered normal.

Some months, your breasts may feel tender when you have your period. Other months, you may notice bloating around your abdomen or mood swings. Other normal menstruation symptoms include:

  • Acne
  • Cramping in the lower abdomen and back
  • More hunger
  • Sleep issues
  • Mood swings
  • Breast tenderness
  • Bloating

Not every period is the same, though. Most of the time, an irregular or abnormal period isn’t serious. But you should call the doctor if:

  • You have a heavier than usual flow
  • You need to change your pad or tampon hourly
  • Your period lasts more than 7 days
  • Your period suddenly stops for more than 90 days
  • You have severe pain
  • You think you might be pregnant


In just 3 months, you can get a picture of what’s normal for you by tracking your periods. Keep a record of:

  • When your period starts and when it stops
  • How light or heavy your flow is
  • Whether or not you passed any blood clots
  • How frequently you change pads or tampons
  • How severe your cramps are
  • Changes in mood
  • Spotting between periods