Experts have identified two symptoms that people may not traditionally associate with Covid-19, but that could indicate infection.
It comes as Professor Luke O’Neill said he believes there will be another Covid surge later this year.
The most common symptoms of Covid-19 were considered to be a cough, fever, loss of taste or smell, shortness of breath, aches and pains, headaches and a blocked or runny nose.
However, researchers have shared two early signs of Covid that some may not initially connect with the virus.
Fatigue and dizziness or fainting are now also thought to be a symptom, the Daily Record reports.
Fatigue is more than just feeling tired. It is feeling pain in your body, with sore and weak muscles, headaches, blurred vision and even a loss of appetite.
A Web MD poll between December 23 and January 4 found that 40% of women reported they struggled with fatigue while it hit one-third of men.
It is also believed Omicron could trigger fainting, according to a new report in Germany where Berlin doctors noticed a 35-year-old patient was having recurring fainting spells.
According to local reports, doctors spotted a "clear connection" between the fainting and the virus.
It comes as a recent study found that these symptoms - including dizziness and fatigue - often persist even after infection and can cause problems with forgetfulness.
Almost 80 percent of Long Covid patients experienced difficulty concentrating, 69 percent reported brain fog, and 68 percent reported forgetfulness.
The severity of these symptoms were linked to the level of fatigue and neurological symptoms, like dizziness and headache, experienced during a person's initial Covid illness.
Half the patients reported difficulty getting medical professionals to take their symptoms seriously.
The University of Cambridge researchers added, "perhaps because cognitive symptoms do not get the same attention as lung problems or fatigue", the Daily Record reports.
The authors say their results support other findings suggesting society will face a "long tail" of workforce illness due to lasting effects of the virus.
"Long Covid has received very little attention politically or medically," said senior author Dr Lucy Cheke.
"It urgently needs to be taken more seriously, and cognitive issues are an important part of this. When politicians talk about 'Living with Covid' – that is, unmitigated infection, this is something they ignore. The impact on the working population could be huge.”
