Omicron has been found to have some unusual symptoms that differ to previous strains of coronavirus.
According to the NHS, the official symptoms of Covid are still a high temperature, a new continuous cough, or a loss or change to your sense of smell or taste.
Dizziness, brain fog, muscle aches, fatigue and loss of appetite are just some of the surprising symptoms you might be struck down with if infected with Omicron.
Another less common symptom of the new strain is feeling sick and nauseous, which can sometimes lead to vomiting.
While 'cold-like' symptoms such as a scratchy throat and a runny nose are some of the more common signs of Omicron, feeling queasy could also be a sign you have the virus.
Is nausea and vomiting a sign of Omicron?
According to experts, gastrointestinal issues such as nausea, diarrhoea and even vomiting could be a sign your body is reacting to virus infection.
Feeling sick and throwing up could actually be caused by your body is working against a Covid-19 infection, The Mirror reports.
Shruti Gohil, M.D., an associate medical director of epidemiology and infection prevention at University of California Irvine Health, says that nausea and vomiting are not primary symptoms for common colds or flu.
However, healthcare experts are seeing an uptick in the number of people picking up Omicron and having uncontrollable vomiting and nausea as some of their primary symptoms.
This makes the symptoms relatively easy to spot compared to a common cold, which is unlikely to cause such a reaction from the body.
UK epidemiologist and professor Tim Spector has also noted gastrointestinal issues in recent Omicron data from the ZOE Covid Symptom App.
The Covid expert and the co-creator of the ZOE Covid Symptom App, created by Kings College London, says nausea and diarrhoea is in the top 20 symptoms, although it's less common.
Writing in a blog post on newsGP - a news site for Australian GPs - Professor Spector explained: " Previously common symptoms such as shortness of breath, fever and loss of smell fell down the rankings. Cold-like symptoms – including a runny nose, sore throat and persistent sneezing – became more common, along with a headache and cough, particularly in people who had been vaccinated.
"Omicron appears to be continuing the trend set by Delta. It’s causing symptoms that are much more like a regular cold, particularly in people who’ve been vaccinated, and fewer general systemic symptoms, such as nausea, muscle pains, diarrhoea and skin rashes."
Researchers on the app - created by King's College London - have since analysed symptoms of the Delta and Omicron variants and allowed comparisons to be drawn.
Many who have contracted Omicron have noted several symptoms which aren't usually associated with coronavirus instead of suffering from the 'classic three'.
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