“I’ve been in hospital since 9am this morning."

Reid, who was famously married to Katie Price, shared a worrying photo and explainer to social media.

The former mixed martial artist who won Celebrity Big Brother wrote: “I’ve been in hospital since 9am this morning. I’ve already had a CT scan, and I’m now waiting for an MRI to check if there’s a bleed on the posterior part of my brain.

“I honestly can’t believe how I’ve been walking lately — so “punch drunk” that people keep assuming I’m drunk when I’m out. I’m not. This is just how my body moves these days, and it’s a horrible feeling not knowing why.

“The pain, the imbalance, the uncertainty… it’s all become really hard to live with.”

Reid continued: “This isn’t a negative post about martial arts, fighting, or “don’t do combat sports.” I love this sport. It’s my life.

“But after around 300 fights, years of martial arts training, and being hit more times than I can count — plus my cauliflower ears to prove it — I want young lads coming up in the sport to start training smarter. Wear your headgear. Look after yourselves.

“Think long-term, not just about the next fight.”

He added: "Thank God the scans so far have shown no tumours. My dad passed away at 77 from a brain tumour, so hearing that today was a massive relief. Now we’re just waiting to see if there’s any bleed or any signs of brain damage that might explain what’s been happening with my walking and balance.

"This is me being honest, raising awareness, and letting people know what really goes on behind closed doors. Combat sports are incredible — but your health is everything.

"I’ll keep everyone posted when I get the results."