MOST people who catch Omicron present with symptoms that are similar to the common cold.
But some people have reported unusual symptoms that you might not usually associate with the bug.
The variant is affecting patients differently, and hitting new parts of the body after mutating from the original coronavirus.
A string of hugely positive studies show Omicron is milder than other strains in the vaccinated, with Covid booster jabs protecting against it.
The NHS states that the three main symptoms of coronavirus are a new persistent cough, a high temperature, or a loss of taste and smell.
Data previously revealed that the three most common Omicron signs plaguing Brits are cough, fatigue and headache.
These vary from the three main symptoms of coronavirus set out by the NHS which have not changed since Covid reached our shores in March 2020.
US medic, Dr Bill Admire said most people who caught the Delta variant would suffer some form of respiratory issue – with upper respiratory issues being the key factor.
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"But with Omicron, patients with gastrointestinal problems are flaring up and having more symptoms", he said.
Professor Tim Spector, from the ZOE Covid Symptom Study, told the Sun Online the variant could be settling in the gut rather than the nose.
This means, when people are infected and experiencing gut symptoms like an upset stomach they will test negative – as there won't be traces of Omicron in the nose or mouth.
The expert explained: "We know that the virus tries to enter the mouth or nose, and shows up in the respiratory system or the lungs.
"And it sometimes goes into the gut and people who have long Covid – they've found traces of the virus in the gut that can last a long time.
"We know that this virus travels to different parts of the body. It's possible that Omicron or another variant is attacking the gut.
"And this would not be showing in the nose – so you could have a gut infection but not show up as positive.
"We could be missing quite a few cases simply by swabbing the nose."
Symptoms of a gut infection include:
- Abdominal pain
The ONS states that the least commonly reported symptoms have consistently been abdominal pain, diarrhoea, and nausea or vomiting.
Experts have however said that while nausea or vomiting might not be key signs of the virus, they could sit along side other symptoms.
Studies have shown that people who have Covid-19 can sometimes experience gastrointestinal symptoms.
Published in the Journal of Microbiology, Immunology and Infection, experts found that that nausea and vomiting were two of the most common symptoms that sat beside other key Covid symptoms such as a sore throat or loss of taste and smell.
The study suggests that issues like diarrhoea, nausea and vomiting could be triggered by the Covid infection.
The reason people are sick, they suggest, is due to the body's inflammatory response to the virus infection.
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