Flu, also called influenza, is an infection of the nose, throat and lungs, which are part of the respiratory system. The flu is caused by a virus. Influenza viruses are different from the "stomach flu" viruses that cause diarrhea and vomiting. Most people with the flu get better on their own.

What is the flu (influenza)? The flu is an illness you get from the influenza virus. It causes symptoms like head and body aches, sore throat, fever and respiratory symptoms, which can be severe. Flu is most common in winter months, when many people can get sick at once (an epidemic). Cleveland Clinic is a non-profit academic medical center.

Influenza (flu) is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and lungs. Learn about flu, including symptoms, prevention methods, and treatment options.

Influenza (Flu) is not a reportable disease in New Hampshire, yet surveillance (data) systems are in place to determine the reach of illness and current virus types being spread. Below are maps for each week during the usual flu season, which begins in early October through mid-May.

1 day ago · Surge in flu cases reported across U.S. as cases peak for a second time 02:46. For a second time this season, the flu is surging, with at least 41 states reporting high or very high levels of the ...

Aug 26, 2024 · Learn about identifying flu symptoms, how the diagnosis works, common complications, and more.

Aug 30, 2024 · Most people with flu have mild illness and do not need medical care or antiviral drugs. If you get sick with flu symptoms, in most cases, you should stay home and avoid contact with other people except to get medical care.

Aug 28, 2023 · It's a super-contagious virus that can make you feel miserable. Doctors call it influenza. Its symptoms are usually more serious than the sneezes and stuffy nose that you tend to get from a...

Aug 29, 2024 · Influenza, aka the flu, is a highly contagious virus that infects your nose, throat, and sometimes your lungs. You can get sick by being around someone with the flu when they cough, sneeze, or...

Jan 28, 2025 · Learn more about how to get your flu shot at Mayo Clinic. To diagnose the flu, also called influenza, your healthcare professional does a physical exam, looks for symptoms of flu and possibly orders a test that detects flu viruses.