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The common cold is a viral infection of your nose and throat (upper respiratory tract). It's usually harmless, although it might not feel that way. Many types of viruses can cause a common cold.
Children younger than 6 are at greatest risk of colds, but healthy adults can also expect to have two or three colds annually.
Causes
The common cold can be caused by more than 200 different viruses. Around 50 % of colds are caused by rhinoviruses, other cold-causing viruses include:
Symptoms
The symptoms of the common cold are the body's reaction to the cold virus. It triggers the release of chemicals, making the blood vessels leak, causing the mucous glands to work harder.
The most common symptoms of a cold are:
