The Delta variant of coronavirus is now the main strain in the UK and some scientists believe people contracting the virus have different symptoms to the officially recognised signs.
The NHS lists three officially recognised signs of coronavirus as: A fever, a new and continuous cough and a loss of smell or taste.
But the new variant appears to be affecting people in different ways to the previous strain, with lots of people reporting new symptoms.
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Many people have reported a headache and a sore throat as the most common symptom they've experienced.
A leading professor says the Delta variant, first identified in India, seems to “working slightly differently” - reports Birmingham Live.
However, it could be because covid is currently causing an epidemic in young people, and symptoms are known to vary by age group.
The ZOE Covid Symptom Study has been tracking the covid outbreak since March 2020, with millions of Brits reporting their symptoms on an app.
Prof Tim Spector, the lead on the study, told The Telegraph: “Since the start of May, we’ve been looking at the top symptoms and they are not the same as they were.
“Number one is headache followed by sore throat, runny nose and fever.
“All those are not the old classic symptoms, number five is cough, so it’s rarer and we don’t even see loss of smell coming into the top 10 anymore.
“This variant seems to be working slightly differently.”
A headache affects 66% of people with covid, according to symptoms reported by app users.
Sore throat 53% and runny nose 49% follow behind.
A loss of taste or smell is no longer in the top 10 symptoms, the app has recently found.
