Article / Updated 03-26-2016
Like the common cold, the flu attacks your respiratory system, but it hits harder and faster. Symptoms include fever over 100 degrees F (37.8 degrees C), severe muscle ache, chills, sweating, fatigue, and congestion.
If you or the person you are caring for has a severe case of the flu and is in a high‐risk category — a young child, an older adult, a pregnant woman, or someone with a compromised immune system — see your doctor immediately.