Common Cold

The common cold is a viral infection of your nose and throat (upper respiratory tract). Many types of viruses can cause a common cold.

Symptoms of a common cold usually appear one to three days after exposure to a cold-causing virus. Signs and symptoms, which can vary from person to person, might include:

• Runny or stuffy nose
• Sore throat
• Cough
• Congestion
• Slight body aches or a mild headache
• Sneezing
• Low-grade fever
• Generally feeling unwell

The discharge from your nose may start out clear and become thicker and yellow or green as a common cold runs its course. This doesn't usually mean you have a bacterial infection.

When to see a doctor

For adults —seek medical attention if you have:

• Symptoms that worsen or fail to improve
• Fever greater than 101.3 F (38.5 C) lasting more than three days
• Fever returning after a fever-free period
• Shortness of breath
• Wheezing
• Severe sore throat, headache or sinus pain

For children —seek medical attention right away if your child has any of the following:

• Fever of 100.4 F (38 C) in newborns up to 12 weeks
• Rising fever or fever lasting more than two days in a child of any age
• Severe symptoms, such as headache, throat pain or cough
• Difficulty breathing or wheezing
• Ear pain
• Extreme fussiness
• Unusual drowsiness
• Lack of appetite