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Health

07th May 2025

Doctor reveals why second day of your period is often worse than the first

Kat O'Connor

Why is day two of your period always the worst?

We’ve been dealing with periods since our teenage years, but they only seem to get worse as we get older.

You never quite get used to the immense pain or the wave of symptoms your period brings every month. It’s something many of us simply have to cope with monthly.

Many of us will agree that the second day of your period can often knock you for six. You may think day one will be the worst, but there’s something about day two that feels immensely worse.

If, like us, you’re often found curled up in a ball with the worst cramps on day two, then there’s actually a scientific reason why.

In an interview with Metro, Dr Fatema Mustansir Dawoodbhoy, an academic doctor specialising in obstetrics and gynaecology, explained why day two is so much worse for many women.

She explained that a lot of it has to do with your hormone levels.

She said the hormone-like chemicals prostaglandins increase when your progesterone levels lower.

“As the lining of your uterus breaks down, prostaglandins (hormone-like chemicals) are released in the body.”

“The prostaglandins also constrict the blood vessels in the uterus, reducing the amount of oxygen the uterine tissue receives, and this leads to cramping and pain.”

The number of prostaglandins peaks on day two of your period, which is why your symptoms often worsen.

The struggle really never ends, does it?

Read more: ‘Why do I go up an entire dress size when I’m on my period?’

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