It for most people Cove in 19 is a relatively mild illness, which passes quickly, but many others are left struggling with symptoms for months Afterwards.

Some can be exhausted just with a short walk.

Others could experience much more.

Severe symptoms are medical editor Fergus Walsh has been investigating.

So initially I couldn't even claim a flight of stairs.

This is what Long co vid can look like.

Okay, arms across your chest.

Suji Yacht Indra is a doctor in a and he got only a mild illness with co vid.

Yet it's left him so exhausted he's being off work for three months.

Date of birth, quite easily.

Lots of muscle aches, um, joint pains.

Ah, that's it.

Really.

If I do exercise the next day, I'm out of it.

Last time.

A minute.

This post covert clinic at London's University College Hospital is diagnosing a vast array of physical, mental and cognitive problems all stemming from coronavirus infection.

So we're seeing people with really severe fatigue on really significant breathlessness.

People who were running marathons at the beginning of the year previously fit in well, didn't need any hospital admission for their co vered.

But six months on our two fatigues to even get to the shops to buy food.

Long Cove It is a huge emerging health problem.

Doctors say there's an urgent need for research into what drives the condition and produces such a wide variety of serious, debilitating symptoms.

Many people are struggling to get help with the after effects of coronavirus.

The boss of NHS England says £10 million will be spent on setting up MAWR Long Co VID clinics across England.

It's clear that there are tens of thousands, probably hundreds of thousands of coronavirus patients with these long co vid symptoms.

So we need specialist clinics like this but also rehabilitation services across the community to both support those patients and to learn more about the best treatments for them.

Like so many with long co vid, Robert Moore had only a minor coronavirus infection.

Yet the 30 year old suffers repeated muscle and joint pain brought on by any physical activity.

A soon as I do anything, whether that's going for a walk or preparing something to eat or doing any form of cognitively difficult tasks.

I'll just find a huge amount of fatigue the next day, whether that's muscular or just a sort of general city.

So far, the focus has been on saving lives in the pandemic.

But Covert is leaving a bitter legacy for many that may stay with them for months or even years.