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Chest infection

A chest infection is an infection of the lungs or large airways. Some chest infections are mild and clear up on their own. Others can be severe and life-threatening.

Symptoms

Chest infections often follow colds or flu.

The main symptoms are:

  • chesty or wet cough - coughing up green or yellow mucus
  • wheezing and shortness of breath
  • high temperature (fever) of 38 degrees Celsius or above
  • headache
  • aching muscles
  • tiredness

These symptoms can be unpleasant, but they usually get better on their own in about 7 to 10 days.

The cough and mucus can last for up to 3 weeks.

Treatment

If you have a chest infection, there are things you can do to ease the symptoms.

Do

  • get plenty of rest

  • drink lots of water to loosen the mucus and make it easier to cough up

  • use painkillers to bring down a fever and ease headaches and muscle pain

  • use extra pillows to raise your head while sleeping

  • drink a hot lemon and honey drink to relieve a sore throat

Don't

  • do not let children breathe in steam from a bowl of hot water because of the risk of scalding

  • do not give aspirin to children under 16

  • do not smoke - it can make your symptoms worse

How a pharmacist can help

Your pharmacist may suggest decongestant treatment. This can help loosen the mucus in your lungs so it's easier to cough up.

Coughing up the mucus helps clear the infection from your lungs.

Urgent advice: Contact your GP if

you have a chest infection and you:

  • feel very unwell or your symptoms get worse
  • cough up blood or blood-stained mucus
  • have a cough for more than 3 weeks
  • are pregnant
  • are age 65 or older
  • have a weak immune system - for example, if you have diabetes or you're having chemotherapy
  • have a long-term health condition, such as a heart or lung condition

If your symptoms are severe, you may have pneumonia.

Treatment from your GP

Treatment will depend on what caused your chest infection. It may be caused by a virus or bacteria.

It can be difficult to tell the difference between a bacterial chest infection and a viral chest infection. Your GP can help you understand which type of chest infection you have.

Viral chest infections

Many chest infections are caused by a virus. This usually clears up by itself after a few weeks.

Antibiotics are not used to treat viral chest infections, like flu or viral bronchitis. This is because they do not work for this type of infection.

If your symptoms are severe, your GP can advise on the best treatment for you.

Bacterial chest infections

Some chest infections are caused by bacteria. Your GP may prescribe a course of antibiotics. Make sure you complete the whole course, even if you start to feel better.

Non-urgent advice: Contact your GP if:

  • your symptoms persist
  • you still feel unwell after a course of antibiotics

How to avoid getting a chest infection

To avoid getting a chest infection you can:

Wash your hands

Washing your hands, especially before eating, protects you from infections such as chest infections.

Avoid touching your face with your hands.

How to clean your hands

Cut down on how much alcohol you drink

Excessive and prolonged alcohol use can weaken your lungs' natural defences against infections.

This can make you more vulnerable to chest infections.

How alcohol affects your health and wellbeing

Stop smoking

Stop smoking if you smoke. People who smoke have a higher risk of developing serious chest infections.

Smoking damages your lungs and weakens your defences against infection.

Get help to quit smoking

If you are age 65 or older or have a serious long-term health condition, you can ask your GP about the annual flu vaccination.

You can also ask them if you should have the pneumococcal vaccine. This vaccine helps to prevent pneumonia.

How to avoid passing on a chest infection

To avoid passing on chest infections to others, you should:

  • wash your hands often with warm water and soap
  • cough into your elbow to stop germs from getting onto your hands and spreading to other people
  • use tissues to trap germs when you cough or sneeze
  • bin all used tissues as quickly as possible
  • have a normal temperature (under 38°C) for at least 24 hours before contact
  • avoid newborns, elderly people, or anyone with a weakened immune system until the cough is completely gone

Page last reviewed: 28 February 2026
Next review due: 28 February 2029

This project has received funding from the Government of Ireland’s Sláintecare Integration Fund 2019 under Grant Agreement Number 123.