One-third of Britons think flu is just a bad cold, but each year thousands of people die of complications following flu. Find out how colds and flu differ. Colds and flu share some of the same symptoms (sneezing, coughing, sore throat), but are caused by different viruses. Flu can be much more serious than a cold. If you're generally fit and healthy, you can usually manage the symptoms of a cold or flu yourself without seeing a doctor. Look after yourself by resting, drinking non-alcoholic fluids to avoid dehydration and avoiding strenuous activity. Painkillers such as ibuprofen or paracetamol can relieve aches and pains.