It's cold and flu season, which means coughs, runny noses and sore throats will be rife at this time of year.With coronavirus cases soaring during the winter months, it's often hard to tell the difference between the symptoms of a common cold, Covid or the new variant Omicron.Due to so many overlapping symptoms, it's important to know the signs and whether to isolate or seek medical help if your illness gets worse.Most colds are mild and last about a week, but some people - especially those with weak immune systems - can develop more serious illnesses such as bronchitis, a sinus infection, or pneumonia, according to the NHS.If you do have any Covid symptoms, the current guidance states that you should get a PCR test as soon as possible and