Unlike other forms of coronavirus, Omicron has some unique symptoms that might not be typical of standard Covid signs.
According to the NHS, the symptoms of coronavirus generally include "a high temperature, a new, continuous cough, or a loss or change to your sense of smell or taste."
However, there has been some evolution when it comes to the virus, according to UK epidemiologist and professor Tim Spector.
The Covid expert and the co-creator of the ZOE Covid Symptom App has recorded 20 main Omicron symptoms thanks to data collected from infected people.
And you may not even realise that some of these symptoms are related to being infected with the virus.
Many who have contracted Omicron have noted several symptoms which aren't usually associated with coronavirus instead of suffering from the 'classic three'.
Writing in a blog post on newsGP - a news site for Australian GPs - Professor Spector explained: "Importantly, we found that only half of people with COVID had any of the classic three symptoms of fever, cough or loss of sense of smell."
Since the beginning of the pandemic, millions have shared their experience of coronavirus symptoms with the ZOE Covid App.
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.
According to the ZOE Covid App, some of the 'common' symptoms - that may not necessary look like coronavirus - include:
- Fatigue
- Dizziness
- Chills
Feeling down
Swollen glands
Diarrhoea
Skin rashes
Eye pain
Hoarse voice
Sneezing
Skipped meals
Unusual muscle pain
The app found 'no significant' differences between Delta and Omicron symptoms but did identify "clear difference" in how common certain symptoms were in Omicron cases compared to previous variants.
For example, a persistent cough came was the sixth in the symptoms most likely caused by Omicron.
Previously, this was in the top three.
A fever fell to position number ten with a change in smell down to 13 and a loss of smell number 17 on the list of likely Omicron symptoms.
Prof Spector wrote: "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.
"He added: "For example, anosmia (loss of smell) was in the top 10 in October but has fallen to 17th place.
"What was once a key indicator of COVID is now only seen in around one in five people testing positive.
"And according to our data, less than a third of people (29%) will ever experience a fever, which is also far less common than we’ve seen in the past."
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