Annoying as it is, a cough is simply your body's way of trying to protect itself, by getting rid of an irritation. The 'irritation' could be a tickle caused by inflammation of the upper airways or a buildup of mucus in the lower airways.
Definitions of Cough
Coughs tend to be described as either dry and tickly, chesty or mucus — and it's easy to tell why. A dry cough is an irritation with a 'dry' sound and is often accompanied with a sore throat. Meanwhile a chesty or mucus cough comes from deeper within and is trying to loosen and get rid of the mucus or phlegm.
Duration of Cough
How long a cough lasts is a very different matter and depends largely on the cause. There's no quick-fire way of curing a cough that's caused by a viral infection. It will usually clear up after your immune system has fought off the virus which can mean anything from two to three days to a couple of weeks. In fact, a lingering cough will often be the last symptom at the end of your cold and flu.
The typical case with a cough caused by a common cold is that it starts off dry causing a discomforting scratch at the back of your throat. Lemsip Dry Cough and Sore Throat Syrup offers effective dual relief to help relieve the dry cough whilst soothing the sore throat. Your cough may become chestier and more mucusy later on as the cold develops. This type of cough can be exhausting, as the body puts a lot of effort into trying to expel the irritating mucus, so why not try Lemsip Cough for Chesty Cough for the relief of deep chesty coughs and to soothe the throat, or Lemsip Mucus Cough & Catarrh Liquid which contains a powerful antiseptic to help kill the source whilst thinning and loosening stubborn mucus.
It is important to stress that if a cough goes on for longer than two weeks after a virus, or gets progressively worse, you should talk to your doctor.