Scientists believe the British should be on the lookout for two other symptoms of Covid as the new variant continues to spread.
For over a year, people have known to watch out for persistent coughs, loss of smell and taste, and fever.
However, as the new variant spreads, research seems to show that the Delta variant is not as normal as the previous variant of the disease.
Scientists have found that user-submitted research found that headaches and sore throats have become the most common symptoms.
Anyone feeling under the weather may want to check that they don’t have the virus, reports the Sun.
A senior professor says the Delta variant, first identified in India, “appears to work a little differently”.
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 via an app.
Professor Tim Spector, who led the study, told The Telegraph, “We have been looking at the main symptoms since early May and they are no longer the same as before.
“Number one is a headache, followed by a sore throat, runny nose and fever.
“None of these are the old classic symptoms, number five is cough, so it’s less common and we don’t even see odor loss in the top 10 anymore.
“This variant seems to work a little differently.”
According to symptoms reported by app users, 66 percent of people with Covid experience headaches.
This is followed by a sore throat (53 percent) and a runny nose (49 percent).
Loss of taste or smell is no longer one of the top 10 symptoms, the app recently discovered.
Another leading UK infection survey found in February Covid is defined by symptoms like chills, loss of appetite, headaches and muscle aches.