Cluster headaches “come on very suddenly without warning causing a sharp, stabbing pain around one eye. Attacks can be as short as 15 minutes or last three hours or more”.

The page states: “Imagine giving birth without painkillers once or twice a day for up to 10 weeks at a time and you have some idea of the sheer misery of cluster headaches.

“Cluster headaches are also called ‘suicide headaches’ because they’re so excruciatingly painful they’ve been known to drive people to take their own lives. They tend to “They’re acknowledged to be the most painful type of headache, worse even than severe migraines. In fact, experts have suggested that cluster headache may be the most painful condition known to medical science.”

Endometriosis also makes an appearance, an extremely painful condition in which cells usually found in the uterus grow elsewhere in the body, causing inflammation, pain and scar tissue. Symptoms include heavy and painful periods, painful sex, exhaustion and stomach and back pain.

The condition can lead to associated mental health problems, such as depression, and fertility issues, and though up to two million women are estimated to be affected by it in the UK, many report that their symptoms aren’t taken seriously.

The condition also came up in the Reddit thread, with one woman describing the pain as feeling like she was being stabbed “with a white hot serrated knife”. Another said: “This is the worst pain I have in how it affects my life. I've had migraines that have made me seriously consider suicide but endometriosis has ruined my life.”

Comment Whats the worst physical pain you've ever experienced?

Redditors discuss the most painful thing you can experience - and the answer (shockingly) isn’t childbirth