How Do I Know If My Period Is Too Heavy?

It’s day two. You changed your tampon before the meeting started, and again before it ended, and the second one wasn’t a close call. You’re now doing the math on the drive home. Is this a lot? Everyone’s period is a lot.

What a typical period looks like

The Office on Women’s Health¹ says the average woman loses about two to three tablespoons of blood during her period. A typical cycle runs 28 days, and cycles anywhere from 24 to 38 days count as regular.

Cleveland Clinic² puts the heavy line at more than five tablespoons.

Tablespoons are hard to count on a pad, so the definitions below rely on signs you can see.

The signs that your period is heavy

The CDC³ lists the signs plainly. You change your tampon or pad in less than 2 hours, or your flow soaks through one or more every hour for several hours in a row. You double up on pads. You change products during the night. Your period lasts more than 7 days. You pass clots the size of a quarter or larger. You have constant pain in your lower belly, or you feel tired, low on energy, or short of breath.

The NHS⁴ adds two that are easy to spot: you bleed through to your clothes or bedding, or you skip exercise and take time off work because of your periods.

That last one matters. A period that makes you plan your week around a bathroom is heavy, whatever the tablespoon count says. The CDC³ says heavy bleeding that keeps you from doing things you’d normally do is itself a sign.

It’s also common. The CDC³ says heavy menstrual bleeding is one of the most common problems women report to their healthcare provider, affecting more than 10 million American women each year, about 1 in 5.

Why it happens

Sometimes there’s no answer. The CDC³ says that for many women with heavy bleeding, providers can’t find the cause.

When there is one, the list is long. Cleveland Clinic² names hormone imbalances such as thyroid disease, PCOS and not ovulating, growths in the uterus such as polyps, fibroids and adenomyosis, infections including chlamydia, gonorrhea and trichomoniasis, bleeding disorders such as von Willebrand disease, medicines like blood thinners and hormonal contraceptives, and pregnancy complications. The NHS⁴ names fibroids and endometriosis, and notes that in rare cases heavy periods can be a sign of womb cancer.

Bleeding disorders are one cause worth knowing the signs of. The CDC’s⁵ bleeding-disorder page uses a smaller yardstick for clots: bigger than a grape. It also lists nosebleeds that start for no clear reason and last more than 10 minutes, easy bruising with no injury, heavy bleeding after a dental extraction or other procedure, a past diagnosis of low iron or anemia, and a family member with a bleeding disorder. If several of those sound like you, say so out loud at the appointment.

What heavy bleeding does to the rest of you

Lost blood takes iron with it. The CDC³ says untreated heavy bleeding can cause anemia, which can leave you feeling tired or weak. Cleveland Clinic² lists fatigue and breathlessness among the signs.

So if you’ve been blaming a bad month, a bad job, or a bad mattress for the exhaustion, check the calendar too.

What the appointment looks like

Cleveland Clinic² says a pelvic ultrasound is the most common test. Blood tests can check for anemia and clotting problems. Depending on what turns up, there may be a transvaginal ultrasound, an MRI, a biopsy of the uterine lining, or a hysteroscopy, a camera inspection of the uterus.

Treatment follows the cause. Cleveland Clinic² lists anti-inflammatory pain relievers, iron, birth control, a medicine called tranexamic acid and hormone therapy, with procedures such as endometrial ablation or hysterectomy further down the list. Which of those fit you is a conversation with your clinician.

The play

Try this: count one cycle

Write down how many pads or tampons you use each day, and how long each one lasts.

Note any clot bigger than a quarter, any night you had to get up to change, and anything you canceled.

Bring the page with you. “It feels like a lot” is hard to act on. “Eight changes on day two, one clot the size of a quarter” is not.

When to get checked

Don’t wait if

1. Emergency

   Go to the ER right away if you soak through two or more pads or tampons an hour for two to three hours in a row. Cleveland Clinic² says that pattern calls for provider contact or emergency evaluation.

2. Same day

   Call your clinician the same day if you’re soaking through a pad or tampon every hour and there is any chance you’re pregnant. Cleveland Clinic² lists pregnancy complications among the causes of heavy bleeding.

The Office on Women’s Health¹ says to talk to your doctor about cycles shorter than 24 days or longer than 38 days, and about period pain or bleeding that makes you miss school or work. The NHS⁴ says to get medical advice if heavy periods affect your daily life, keep going, involve severe pain, or happen between periods or after sex.

Book an appointment if any of these fit:

• Your period lasts more than 7 days
• You change a pad or tampon every 1 to 2 hours, or less
• You pass clots the size of a quarter or larger
• You feel tired, weak or short of breath
• You bleed between periods or after sex
• You have a family history of a bleeding disorder, or you bruise and have nosebleeds easily

Back in that meeting, the question was whether this is a lot. After one cycle of counting, you’ll have an answer for it.