Mum's 'strange' symptom that led to a Parkinson's disease diagnosis

“So, what happens is the week before your period your oestrogen levels and hormones drop, and with that, your dopamine drops,” explained Richelle.

“That’s the neurotransmitter that people with Parkinson’s wouldn’t have as much of.

“So, for women who don’t have Parkinson’s, you have PMS [pre-menstrual syndrome] and feel groggy and brain fog.

“They’re all to do with your oestrogen levels dropping and dopamine dropping.