The common cold is an infection of the head and chest caused by a virus. It can affect your nose, throat, sinuses, and ears. It can also affect the tube that connects your middle ear and throat, and your windpipe, voice box, and airways.
Viruses are germs that cause infections.
Over 200 different viruses can cause colds. The infection is spread when viruses are passed to others by sneezing, coughing, and personal contact. There is no specific test. Your doctor will make the diagnosis based on your symptoms and a physical exam. There are no medicines that cure the common cold.