Lungs & Respiratory System
Flu (Influenza)
A viral infection that can cause fever, aches and fatigue, and can be more serious than a cold.
Overview
Influenza is a contagious respiratory illness caused by influenza viruses. It tends to come on suddenly and can be more severe than a cold, especially for older adults, young children and people with certain conditions.
Common Symptoms
- Sudden fever or chills
- Muscle or body aches
- Tiredness and weakness
- Cough and sore throat
- Headache
Possible Causes
- Influenza viruses spread through droplets
- Contact with contaminated surfaces
Risk Factors
- Older age or young age
- Pregnancy
- Chronic conditions such as asthma or diabetes
- Weakened immune system
Diagnosis
Healthcare professionals may diagnose from symptoms, especially during flu season, and can confirm with tests when needed.
Treatment & Management
Rest, fluids and comfort measures help most people. Antiviral medicines may be considered for some people at higher risk, ideally started early.
Prevention & Healthy Habits
Annual vaccination, handwashing, covering coughs and staying home when unwell reduce spread.
When to Seek Medical Care
- Difficulty breathing or chest pain
- Persistent high fever
- Confusion or severe weakness
- Symptoms that improve then return worse
Questions to Ask Your Doctor
- Is this the flu or a cold?
- Should I take antivirals?
- When is the vaccine recommended for me?
- What warning signs should I watch for?
Related Topics
Related Symptoms
HealthCareTastic provides educational information and is not a substitute for professional medical advice, diagnosis or treatment.