Chest X-ray

Written & medically reviewed by Dr. Sanjay Anbu, MBBS · Last reviewed 27 September 2026

A chest X-ray is a quick, painless scan that uses a small dose of radiation to take a picture of the lungs, heart and chest wall. It is one of the most common imaging tests.

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Causes & risk factors

To check for chest infections such as pneumonia
To investigate a cough, breathlessness or chest pain
To look at the heart size and outline
To check for fluid or air around the lungs
To look for lung problems or masses
To check the position of tubes or devices

Common symptoms

Tests & diagnosis

How X-rays work
CT scan of the chest for more detail
Chest ultrasound for fluid

Treatment & management

It is quick and painless — you stand against a plate and hold your breath
You may be asked to remove clothing and jewellery from the chest
It shows the lungs, heart outline, ribs and major airways
The radiation dose is very low
Tell staff if you are or might be pregnant

When to see a doctor urgently

When you have a persistent cough, breathlessness or chest pain
To investigate a suspected chest infection
When your doctor wants to check your heart or lungs

Not a diagnosis. MedDroid gives general educational information about chest x-ray. It cannot examine you, diagnose or prescribe — always confirm with a qualified doctor.

Frequently asked questions

Is a chest X-ray safe?

Yes. It uses a very small dose of radiation — roughly what you would get from a few days of normal background radiation. The benefit of the information usually far outweighs this tiny risk.

Do I need to prepare for a chest X-ray?

No special preparation is needed. You will be asked to remove clothing and jewellery from the chest area and to hold your breath briefly while the picture is taken.

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Sources & further reading

Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.