All about your period: what’s normal, and when you should see a doctor

Click to play video: 'Period myths debunked'
Period myths debunked
WATCH: Experts are setting the record straight on common misconceptions about menstruation – Jan 30, 2019

Your period is a monthly visitor that lots of women don’t really like to talk about.

That can be a problem, experts say, because it makes it harder to know exactly what’s ordinary and what could be an indication of an underlying medical issue.

When it comes to bleeding, for example, “It’s hard for women because we don’t know how much blood other women lose, so people tend to think that what’s normal for them is normal,” said Dr. Jennifer Blake, CEO of the Society of Obstetricians and Gynaecologists of Canada.

She’d like women to appreciate their “elegant” cycle, she said, and understand that periods are not a shameful thing.

Here’s what’s normal to experience during your period, and when you should consider seeing a doctor.

What is the period?

In simple terms, a period is the shedding of the uterine lining. This lining builds up over the course of the month in preparation for a pregnancy, Blake said. “If you don’t get pregnant, the body’s hormone levels drop, and when the hormone levels drop, the lining comes away.”

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That’s when you bleed.

WATCH: Don’t panic if your period is late!

Click to play video: 'Don’t panic if your period is late!'
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Women typically bleed more at the beginning of their period than the end, said Dr. Catherine Allaire, medical director of BC Women’s Hospital Centre for Pelvic Pain & Endometriosis.

It’s obviously hard to measure whether your bleeding fits within a normal range (two to three tablespoons, according to the SOGC) but there are definite signs of excessive bleeding, she said.

WATCH: Menorrhagia is a medical term that’s used when a woman’s period lasts longer than seven days or is unusually heavy. 

Click to play video: 'What is menorrhagia? Why you should talk to your doctor about heavy periods'
What is menorrhagia? Why you should talk to your doctor about heavy periods

“If someone is having to change their protection more than every few hours, or having accidents, bleeding through protection or having to get up at night to change protection so they don’t have stained sheets, or are passing large clots, all that would be considered abnormal bleeding or heavy menstrual bleeding,” Allaire said.

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“You put on a pad and then in an hour you have to change it because it’s completely soaked,” would be an example of excessive bleeding that should be looked into, Blake said.

Excessive bleeding could be caused by things like fibroids, malignancies in the cervix and uterus and a number of other conditions, Allaire said. Left unchecked, she’s even seen it result in anemia — where the woman doesn’t have enough iron.


There is a fair amount of variation in women’s cycles, but a normal cycle is considered anywhere from 21 to 35 days between the first day of one period to the first day of the next, according to the SOGC.

Bleeding usually lasts between three and eight days, according to their website.

Big deviations from this timing can be cause for concern. It’s normal during the first few years of menstruation for a girl’s cycle to be a bit irregular, Allaire said, but after that, if you skip periods for more than three months and you’re not pregnant, you should mention it to your doctor.

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Also, if you’re bleeding outside of your regular period, or during intercourse, that could be cause for concern, Blake said. “Always investigate bleeding that doesn’t fit with the cycle.”

Frequently skipping periods could be an indication of stress, irregular ovulation, too much exercise, an eating disorder, or other things, and it’s important to find out, she said.

“Anyone who is not getting their period needs to know why they’re not getting their period.”


A little bit of discomfort during your period is normal, Allaire said, though not everyone experiences it.

This pain should be easily controlled by simple over-the-counter pain medications like ibuprofen or naproxen, and shouldn’t interfere with your everyday life, she said.

“If you’re planning your life around your period, it’s interfering with your activities and things like Advil are not sufficient to manage your cramps, then that would be something that should be alerting you to seek attention from a physician.”

Pain should not be associated with things like nausea and vomiting, she said. It also shouldn’t radiate down your legs, said Blake.

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Excessive pain could be an indication of endometriosis, Allaire said, a condition that on average takes years to diagnose — meaning the woman is living her life in incredible pain.

Pain shouldn’t be ignored, she said, and it’s not just part of “being a woman.”

“I’ve heard this story too much: that it’s normal, it’s to be expected that you will have this pain as a woman. And the type and severity of pain that women have suffered with in silence and not sought help for is quite staggering at times when I listen to the stories.”

WATCH: Here’s what you need to know about endometriosis

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Pelvic pain outside of your period should also be looked into, she said.

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There are treatments available for most conditions that can be causing problems during menstruation, she said, so it’s important to seek help.

The Society of Obstetricians and Gynaecologists has extensive information about periods on their website:

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