A chest infection is an infection of the lungs or airways. Bronchitis and pneumonia are two of the main types of chest infection.
Chest infections often follow colds or flu and are particularly common during autumn and winter. Many are mild and get better by themselves, but some chest infections can become serious and may require medical treatment.
The appropriate treatment depends partly on what is causing the infection. Viral chest infections will not respond to antibiotics, whereas antibiotics may be needed for some bacterial infections such as bacterial pneumonia.
This article looks at the symptoms and causes of chest infections, how they are diagnosed and how a chest infection may be treated.
What Are the Symptoms of a Chest Infection?
Symptoms that might indicate you have a chest infection include:
- Chest pain or tightness
- Breathlessness or wheezing
- A persistent cough
- Coughing up greenish-yellow phlegm or blood
- A high temperature
- A rapid heartbeat
- Headache
- Fatigue
- Joint pain
- Loss of appetite
- Feeling hot or sweaty
- Feeling disorientated
Symptoms vary depending on the type and severity of the infection.
What Causes a Chest Infection?
Chest infections can be caused by either viruses or bacteria.
An infection caused by a virus, such as viral bronchitis, will normally clear up by itself within a few weeks and will not respond to antibiotics.
If an infection is caused by bacteria, such as bacterial pneumonia, antibiotics may be prescribed. If you are prescribed antibiotics, it is important to take them as directed.
Chest infections can spread when an infected person coughs or sneezes, releasing tiny droplets containing the virus or bacteria.
Infection can also be spread when someone coughs or sneezes onto their hands and then touches another person or a surface. If someone else touches the contaminated surface and then touches their mouth or nose, the virus or bacteria may enter their body.
How is a chest infection diagnosed?
Your doctor will ask about your symptoms and carry out a physical examination.
Depending on your symptoms and their severity, further investigations may be recommended. These can include:
- Blood tests
- A chest X-ray
- Breathing tests
- Testing a sample of phlegm
These investigations can help determine the cause and severity of the infection and whether further treatment is required.
How Is a Chest Infection Treated?
Treatment for a chest infection depends on its cause and severity.
Many mild chest infections can be managed at home and will improve without specific medical treatment.
Treating a Mild Chest Infection at Home
If you have a mild chest infection:
- Get plenty of rest
- Drink plenty of fluids to help prevent dehydration and loosen mucus
- Take appropriate painkillers to relieve headaches, joint pain and fever
- Use extra pillows to raise your head while sleeping if coughing is disturbing your sleep
Coughing helps remove phlegm from the lungs, so cough medicines are not always recommended when you have a productive cough.
Do You Need Antibiotics for a Chest Infection?
Antibiotics do not work against viral infections.
Your doctor may prescribe antibiotics if you have a bacterial infection such as bacterial pneumonia, or if there is a significant risk of complications.
If antibiotics are prescribed, take them according to your doctor’s instructions.
Are Antiviral Medicines Used for Chest Infections?
In some circumstances, antiviral medication may be recommended for influenza, particularly for people who are at greater risk of developing serious complications.
Whether antiviral treatment is appropriate will depend on your circumstances and should be discussed with a healthcare professional.
When Should You See a Doctor About a Chest Infection?
Many mild chest infections improve with rest and appropriate self-care.
However, you should seek medical advice if:
- Your cough has lasted for three weeks or more
- Your breathlessness is worsening
- You have a persistent fever
- Your symptoms are getting worse rather than improving
- You are in a group at greater risk of complications
Seek urgent medical advice if you:
- Have severe difficulty breathing
- Have a very high or unusually low temperature
- Experience significant pain when breathing or coughing
- Cough up blood
- Become confused, dizzy or lightheaded
- Are repeatedly vomiting
- Experience significant heart palpitations
Who Is at Greater Risk of a Serious Chest Infection?
While anyone can develop a chest infection, some people are at greater risk of serious illness or complications.
These include:
- Older people and very young children
- Smokers
- People who are overweight or obese
- Pregnant women
- People with a weakened immune system, including some people undergoing chemotherapy
- People with long-term health conditions such as COPD, chronic kidney disease, heart disease or asthma
If you are at increased risk and develop symptoms of a chest infection, you should seek medical advice if you are concerned or your symptoms are worsening.
Can You Prevent a Chest Infection?
Chest Infections – FAQs
When should I see a doctor?
Many chest infections respond well to the at-home treatments described below. However, you should talk to your doctor if you have a cough that has lasted for three weeks or more, worsening breathlessness, a fever or if your symptoms are not improving. Seek urgent medical advice if you have a very high or low temperature, experience pain when coughing or breathing, start to cough up blood, feel confused dizzy or lightheaded, are vomiting or have heart palpitations.
Who is particularly at risk of serious chest infection?
While anyone can develop a chest infection, certain groups of people are at particular risk of developing serious symptoms. These include:
- People who are elderly or the very young
- Smokers
- People who are overweight or obese
- Pregnant women
- People with a weakened immune system, such as those undergoing chemotherapy
- Anyone living with a long-term health condition like COPD, chronic kidney disease, heart disease or asthma
If you are at high risk of serious infection, it’s important to see medical advice if you develop symptoms of a chest infection.
Can I prevent a chest infection?
Good hygiene is an effective way to avoid developing a chest infection or spreading the infection to others if you have one. Cover your mouth and nose when you sneeze or cough. Wash your hands regularly and put used tissues into the bin. All of the usual measures that help you to stay fit and well apply to preventing chest infections. Eat a healthy balanced diet, stay well-hydrated, avoid excessive alcohol consumption and, if you smoke, take steps to quit. Make sure you’re up to date with your annual flu vaccine if you’re over 65 or have a serious long-term health condition.
To discuss the diagnosis and treatment options for a full range of respiratory conditions, including chest infections, contact Dr Shalin Diwanji.



