The Coronavirus Jab's Most Tantalising Side Effects? It May Help Fight Cancer, Chronic Pain...

Joan Wakefield has barely been able to walk for the best part of six months. The 72-year-old from Stockport had a knee replacement in October and has since suffered infections in the scar tissue, causing agonizing pain.

Then at the beginning of this month she received the first dose of AstraZeneca's Covid-19 vaccine. 'I woke up the next morning and the leg pain and stiffness was gone,' she says.

'I couldn't believe it. I joked with my partner about whether the vaccine had anything to do with it. Previously, I couldn't even bend my leg. Now I can extend it fully, and even put my shoes and socks on. I'm optimistic I'll be able to return to work sooner, rather than later, now.'

It seems ludicrous – a vaccine designed to protect against one virus can, somehow, improve other totally unrelated elements of health.

But Joan Wakefield is far from alone. 

Last month, Mail on Sunday GP Ellie Cannon wrote about the curious case of a man with Lyme disease who'd found his long-term fatigue had evaporated just days after having the Covid vaccine. Scores of you wrote in to tell similarly miraculous tales.

One has seen stubborn patches of eczema on her arms, legs and midriff mysteriously disappear within hours of having the jab. Another claimed that the dizzying vertigo she's battled for 25 years vanished four days after her shot.

Meanwhile, a woman wrote that her husband had enjoyed a full night's sleep for the first time since his diagnosis of a sleep disorder 15 years ago. Even more bizarrely, some claimed to have been left in better health having contracted the virus itself.