The Common Could is an infection of the head and chest, caused by a virus. It can affect your nose, throat, sinuses, ears, tube that connects the middle ear and the throat, windpipe, and bronchial tubes.
Many different viruses can cause the common cold.
Each virus may have a slightly different pattern of symptoms and severity. Well over 100 types of cold viruses are known. Infection may be facilitated by excessive fatigue, emotional stress and other factors that weaken the body's immune defenses. Bacteria that live in the nose and throat can gain a foothold and cause secondary infection such as ear infections, bacterial sinusitis and bacterial bronchitis. Symptoms and Signs Colds usually begin abruptly.