Yet, there is no specific remedy available to make it less common. It generally affects the children more compared to the elders, because the immunity of the former is not matured. Cold may not be a serious disease, but still it disturbs and irritates a lot. Let us know that what really happens when the common cold attacks. According to modern science, cold is usually a viral infection of the linings of the upper respiratory tract.
Viruses enter and eventually destroy vulnerable cells in the mucous membrane of the nose and throat.
Normally, the membranes in our nose and throat produces coat of mucus that traps inhaled dust, pollen, viruses and bacteria. Then this mucus propels back through the nose and into the oesophagus where in digestive tract it gets destroyed. When virus attack, powerful defensive response of our body produces antiviral chemicals. If the infection still persists, membrane cells produce inflammation that cause dilatation of blood capillaries. As more blood flows through this expanded vessel, affected area becomes warm and reddens.