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Up to 30% of patients who are seriously ill with coronavirus are developing dangerous blood clots, according to medical experts.

They say the clots, also known as thrombosis, could be contributing to the number of people dying.

Severe inflammation in the lungs - a natural response of the body to the virus - is behind their formation.

Patients worldwide are being affected by many medical complications of the virus, some of which can be fatal.

Back in March, as coronavirus was spreading across the globe, doctors started seeing far higher rates of clots in patients admitted to hospital than they would normally expect.

And there have been other surprises, including the discovery of hundreds of micro-clots in the lungs of some patients.

The virus has also increased cases of deep vein thrombosis - blood clots usually found in the leg - which can be life-threatening when fragments break off and move up the body into the lungs, blocking blood vessels.

'Serious trouble'

Artist Brian McClure was rushed to hospital last month suffering from pneumonia brought on by coronavirus. But soon after he arrived, he had a scan showing he was in a bigger fight for his life.

"I went for a lung screening and that showed blood clots in the lungs. I was told that was very dangerous," he said.

"That was when I really started to get worried. I got the picture that if I didn't improve then I would be in serious trouble."

He is now continuing his recovery at home.