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Flu

Also called Influenza

Flu (influenza) is a common infection caused by a virus that spreads through coughs and sneezes. Symptoms come on quickly and are usually worse than a cold. Most people recover within a week, but flu can be serious for older people, pregnant women, young children and people with long-term conditions.

Last updated Nov 9, 2026

What it is

Rest, fluids and pain relief help. Antiviral medicines are sometimes given to people at higher risk.

A yearly flu vaccine is the best protection and is recommended for people at higher risk.

Common signs

  • Sudden high temperature
  • Aching body
  • Feeling tired or exhausted
  • Dry cough
  • Sore throat
  • Headache

How it is usually diagnosed

  • Usually based on symptoms
  • A swab test, sometimes

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Vaccination dates
  • Swab test results
  • Notes about complications or hospital stays

Questions to ask your doctor

  • Should I have the flu vaccine?
  • Do I need antiviral medicine?
  • When should I seek help if I get worse?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Difficulty breathing, chest pain, confusion or a seizure: call 112

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

Sources

Related conditions

Common coldA mild viral infection of the nose and throat. It usually gets better on its own within about a week.PneumoniaAn infection that inflames the air sacs in the lungs. It can be mild or serious and is usually treated with antibiotics.Chest infectionAn infection of the lungs or airways, such as bronchitis or pneumonia. Most are mild and clear up on their own.