Cough is a common viscous and thick liquid substance, which forms many linings of the body tissue. In general language makes it the respiratory system i.e. our breathing system. Cough is considered essential for body function. It prevents other organs from drying out and keeps them moist. It can be dangerous if the quantity of cough increases and its color changes. This condition may be a sign of another disease or health problem. During infection, cough contains viruses or bacteria, which are responsible for infection. Excessive mucus in the throat is a sign of serious problem. Cough in the throat may block the respiratory tract.

Cough is of many types e.g., some of which are Dry Cough, Wet Cough, Whooping Cough, Choking, Chronic Cough.