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Influenza

Flu (influenza) is an infection of the nose, throat and lungs, which are part of the respiratory system. Influenza

Overview

Flu (influenza) is an infection of the nose, throat and lungs, which are part of the respiratory system. Influenza is commonly called the flu, but it's not the same as stomach "flu" viruses that cause diarrhea and vomiting.

Most people with the flu get better on their own. But sometimes, influenza and its complications can be deadly. People at higher risk of developing flu complications include:

• Young children under age 2
• Adults older than age 65
• Residents of nursing homes and other long-term care facilities
• People who are pregnant or plan to be pregnant during flu season
• People with weakened immune systems
• American Indians or Alaska Natives
• People who have chronic illnesses, such as asthma, heart disease, kidney disease, liver disease and diabetes
• People with a body mass index (BMI) of 40 or higher

Symptoms

• Difficulty breathing
• Pale, gray or blue-colored skin, lips or nail beds — depending on skin color
• Chest pain
• Dehydration
• Severe muscle pain
• Seizures
• Worsening of existing medical conditions

is commonly called the flu, but it's not the same as stomach "flu" viruses that cause diarrhea and vomiting..