WEIRD OR WHAT

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Period Facts That'll Blow Your Mind

Think you know all there is to know about periods? These period facts will blow your mind (and make you feel really smart the next time you walk down the tampon aisle).

1. A rare period disorder can cause bleeding of the eyes. Known as vicarious menstruation, this rare (but terrifying) condition makes you bleed from organs besides your uterus — like your eyes — while you’re on your period, according to a case study published in the journal Ophthalmic Plastic & Reconstructive Surgery. Luckily, only a handful of cases have been recorded, according to study authors, who say this condition is caused when endometrial tissue (which normally grows in your uterus and sheds during your period) is transmitted through the bloodstream.

2. Most women have period stains in *every* pair of underwear. Fifty-four percent of 36,000 women surveyed by THINX said they ruined every pair of underwear they owned due to their period.

3. Getting your period can worsen asthma symptoms. In the week leading up to your period, an increased sensitivity to allergens, paired with a lower-than-normal lung capacity, causes between 19 and 40 percent of women with asthma to experience premenstrual asthma (PMA), according to a study published in the journal Multidisciplinary Respiratory Medicine. (The study authors say hormonal changes may be to blame.)

4. Sleeping with a nightlight can help regulate your cycle. Light exposure affects the secretion of the sleep hormone melatonin, which helps control the release of the female reproductive hormones that determine when your menstrual cycle begins and ends: In a study published in the journal Psychiatry Research back in the early 90s, women with extra long or irregular cycles who slept next to a regular 100-watt light bulb for a few days during the last two weeks of their cycles shortened their cycles by an average of 12 days, meaning this targeted approach could help regulate your periods. The key is to sleep with the light on during the last two weeks of your cycle. Keeping it on at all times might actually make your periods more irregular, since shift workers report irregular periods.

5. There are more than 5,000 euphemisms for periods around the world. Including: “‘Les Anglais ont debarqué,” which in French means, “The English have landed,” and “Erdbeerwoche,” which in German means, “Strawberry week,” according to a survey by Clue, a menstrual cycle-tracking app.