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COVID-19 vs. flu: Similarities and differences
Find out the similarities and differences between coronavirus disease 2019 (COVID-19) and the flu (influenza) and learn about ways to prevent getting these diseases.
COVID-19, cold, allergies and the flu: What are the differences?
Knowing if you have COVID-19, a cold, the flu or seasonal allergies isn't easy. Find out about the differences between these illnesses.
Coma
Learn what can cause this state of prolonged loss of consciousness. While a coma rarely lasts longer than a few weeks, some people never wake from one.
Diarrhea
Learn more about what causes this common, unpleasant digestive condition, and how you can treat and prevent it.
Flu symptoms: Should I see my doctor?
See a healthcare professional if you are at high risk for complications from flu.
Headache
Headache: Symptom — Overview covers definition, possible causes of this painful symptom.
Heart attack symptoms: Know what's a medical emergency
Watch for these heart attack symptoms.
Heavy menstrual bleeding
Learn about the causes and treatment of heavy menstrual periods.
Pericarditis
Inflammation of the tissue surrounding the heart can cause sharp chest pain and other symptoms. Know how pericarditis is diagnosed and treated.
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