FLU
This is an infectious viral illness especially prevalent in winter, and can be spread by coughs and sneezes. Although not nice, you'll usually begin to feel better within about a week.
Flu is caused by a different group of viruses to a cold and the symptoms tend to start more suddenly, be more severe and last longer. They include a high temperature, tiredness and weakness, headache, aches and pains, and a cough. If you’re otherwise fit and healthy, there’s no need to see a doctor. The best remedy is rest at home, staying warm and drinking water to avoid dehydration. Take paracetamol or ibuprofen to help ease symptoms. If they get worse or haven’t improved after a week, you should seek medical help.