Viruses cause familiar infections such as the common cold, but they also cause severe illnesses. Learn more about viral infections and their symptoms.| medlineplus.gov
Asthma causes one's airways to become sore and swollen. An attack means a person's lungs are getting less air. Learn about two types of treatment.| medlineplus.gov
The flu (influenza) is a viral respiratory illness that causes fever, chills, runny nose, body aches, and cough. It spreads easily from person to person. The flu can cause moderate to severe symptoms.| medlineplus.gov
Coughing helps your body heal or protect itself. There are two types of coughs: acute and chronic. Learn the causes of chronic cough.| medlineplus.gov
Used properly, antibiotics can save lives by fighting bacterial infections. Read about how to use antibiotics and about when not to use antibiotics.| medlineplus.gov
Diarrhea can range from mild to severe and can be dangerous in children. Find out what you can do to treat symptoms and when to call your doctor.| medlineplus.gov