Flu (Influenza)

A woman blowing her nose in bed with a thermometer and medications on her nightstand.

The flu, or influenza, is a contagious respiratory illness caused by influenza viruses that can lead to mild to severe symptoms and, in some cases, serious complications.

Quick Facts

  • The flu spreads easily from person to person
  • Symptoms often appear suddenly
  • Seasonal flu is most common in fall and winter
  • Annual vaccination is the best prevention
  • Older adults, young children, and people with chronic conditions are at higher risk

Flu Symptoms

Flu symptoms typically come on quickly and may include:

  • Fever or chills
  • Cough and sore throat
  • Runny or stuffy nose
  • Muscle or body aches
  • Fatigue or weakness
  • Headache
  • Nausea, vomiting, or diarrhea (more common in children)

What Causes The Flu?

The flu is caused by influenza viruses that infect the nose, throat, and lungs. The virus spreads through:

  • Respiratory droplets from coughing, sneezing, or talking
  • Close contact with an infected person
  • Touching contaminated surfaces and then touching the mouth, nose, or eyes

Flu Symptoms

People at increased risk for flu complications include:

  • Adults age 65 and older
  • Young children
  • Pregnant individuals
  • People with chronic medical conditions
  • Individuals with weakened immune systems

Treatments for the Flu

Most people recover from the flu with rest and supportive care, but treatment options may include:

  • Rest and increased fluid intake
  • Fever-reducing or pain-relieving medications
  • Antiviral medications for certain individuals, especially when started early
  • Monitoring for complications in high-risk patients

Specialties That Treat This Condition

What To Do Next?

If symptoms persist or interfere with daily life, a healthcare provider can help evaluate the cause and discuss appropriate next steps.
Medical Disclaimer: This content is provided for general educational and informational purposes only and does not constitute medical advice, diagnosis, or treatment. Conditions and treatment options vary by individual. Always consult a qualified healthcare provider regarding symptoms or medical concerns.