Cough
A cough is a common sign in many respiratory tract illnesses that indicates inflammation of the trachea, bronchial tree and inner lining of the lungs. However, a persistent, nagging cough is a classic sign of acute bronchitis. During the initial phase, it is non-productive or dry in nature for the first two to three days. Later, with the progression of infection, it becomes productive and brings up clear, yellow, or green mucus. The color of a cough reflects the type of bacterial infection. Your doctor may prescribe specific antibiotics (depending on the color of a cough and laboratory tests) and cough suppressants to subside this sign. It usually resolves with medicine, however, may linger for several weeks after the treatment.