PMDD

PMDD, which is a severe cyclical, hormone-based mood disorder linked to periods, is thought to affect more than one in 20 women.

Lead author Dr Sophie Hodgetts said the study "clearly highlights the need for greater clinical recognition of the interpersonal impact of PMDD".

That is, until she was diagnosed with PMDD, which could affect up to 8% of people who have periods in the UK.

It's not clear what causes PMDD, but it's been linked to being very sensitive to changes in hormones, or certain differences in the genes you inherit from your parents.

Claire Phipps, a doctor specialising in women’s health, says health experts need more education on how to spot the signs that someone has PMDD.