Back to top
Menu
Lung cancer
How cancer develops
How cancer develops
What is lung cancer?
You may get lung cancer if cells in your lungs grow in an uncontrolled way. The cells usually form a lump (tumour).
Your lungs move oxygen from the air you breathe into your blood and remove carbon dioxide as you breathe out. They’re made up of lots of air tubes (called bronchioles) and air sacs (called alveoli).
You have different types of cell in the different parts of your lungs. This means you can get different types of lung cancer.
When a tumour starts in your lung, this is called primary lung cancer. Sometimes cancer spreads to your lungs through your bloodstream or immune system from another part of your body, such as your kidney, breast or prostate. This is called secondary lung cancer.
One in every 13 men and one in every 15 women will be diagnosed with lung cancer at some point in their life.
Types of lung cancer
The two main types of cancer that start in the lung are non-small cell lung cancer (NSCLC) and small cell lung cancer (SCLC). These names come from how the cancer cells look under a microscope.
Non-small cell lung cancer
Nearly nine in every 10 primary lung cancers are NSCLC. The three main types of NSCLC are all different, but doctors tend to group them together because they’re treated in a similar way.
- Adenocarcinoma mainly affects the outer part of your lungs. Around four in every 10 people with NSCLC has adenocarcinoma. This can be related to smoking and exposure to asbestos. But it’s also the type of lung cancer you’re most likely to get if you don’t smoke.
- Squamous cell carcinoma affects your main airways (your bronchi), usually near the centre of your lungs. Around three in every 10 people with NSCLC will have this type of lung cancer.
- Large cell carcinoma can appear in any part of your lungs. It affects less than one in every 10 people with NSCLC.
Small cell lung cancer
Between one and two in 10 people with lung cancer has SCLC. SCLC can occur quickly and spread to other parts of your body early on, often before it’s been diagnosed. This makes SCLC particularly difficult to treat. SCLC is almost always caused by smoking.
Symptoms of lung cancer
Many people with lung cancer have no symptoms at first. Or sometimes the early symptoms can be very general, such as a cough or feeling a bit out of breath. You may think these symptoms are caused by smoking or a much less serious condition, such as asthma. Lung cancer is sometimes only discovered during a routine chest X-ray.
Lung cancer can cause:
- a cough that doesn’t go away or gets worse
- coughing up blood
- shortness of breath
- pain in your chest
- regular chest infections
- losing weight for no reason
- feeling very tired
- losing your appetite
If you’re coughing up blood, have a persistent cough or are short of breath, see your GP as soon as possible, especially if you’re over 40. If you’ve had any of the other symptoms for longer than three weeks, contact your GP surgery for advice.
Other symptoms of lung cancer include:
- swelling of your face or neck
- a hoarse voice
- broadening or thickening of the tips of your fingers (called clubbing)
If you have any of these symptoms, see your GP as soon as possible.
Diagnosis of lung cancer
Seeing your GP
Your GP will ask you about your symptoms and medical history and whether or not you smoke. They may ask you to wait and see if your symptoms get better on their own, especially if you’re younger and have never smoked. This is most likely if your cough started when you had a cold or flu and you have no other symptoms.
Your GP will refer you for a chest X-ray, a scan or an urgent clinic at the hospital, if they think your symptoms could be caused by lung cancer. You may have an urgent referral if you’re over 40 or if you smoke or have done in the past.
Referral to a specialist
If your chest X-ray shows signs of lung cancer, your GP will refer you to a doctor who specialises in chest disease. If your GP is particularly worried about your symptoms, they may refer you even if your X-ray seems normal or before you have any X-rays.
The specialist will ask you to have various tests to confirm whether or not you have lung cancer. If you do have cancer, the tests can show which type of cancer you have, how advanced it is and if it’s spread. This is called cancer staging.
These tests may include the following.
- A CT scan of your chest and tummy. This uses X-rays to make three-dimensional (3D) images of part of your body. This is usually the first test you’ll have after a chest X-ray.
- A PET-CT (positron emission tomography) scan. You may be offered this special form of CT scan if you have early-stage cancer. It helps doctors to see where your cancer is and if the cancer has spread.
- A bronchoscopy. This test lets your doctor look inside your lungs and take a sample of tissue (a biopsy). A bronchoscope is a narrow, tube-like telescopic camera. You’ll be given an anaesthetic spray and some medicine to make you sleepy before the doctor passes the bronchoscope down your windpipe into your lungs.
- A needle biopsy through the skin of your chest wall. This is called a percutaneous transthoracic needle biopsy. It may be the best way to reach your cancer to do a biopsy if your cancer is in the outer part of your lung. Your doctor will numb your skin then insert a fine needle through it. They may use an ultrasound or CT scan to guide the needle into the right place.
Treatment of lung cancer
How your lung cancer is treated depends on which type of cancer you have, how far it’s spread and your general health. Lung cancer can be difficult to cure because it may have already spread by the time you’re diagnosed.
- Non-small cell lung cancer (NSCLC) that’s at an early stage and hasn’t spread is usually treated with surgery first. This may cure some types of NSCLC. Surgery may be followed by chemotherapy. Sometimes radiotherapy combined with chemotherapy, or radiotherapy alone, may be given as an alternative to surgery to cure the cancer. If the cancer has already spread, you may be offered treatments such as chemotherapy or immunotherapy first.
- Small cell lung cancer (SCLC) is usually treated with chemotherapy rather than surgery. This is because the cancer has often spread by the time it’s diagnosed. Chemotherapy for SCLC is sometimes combined with radiotherapy.
Your doctor will discuss all of your treatment options with you. They’ll also advise you to stop smoking, as this will help to reduce the side-effects of your treatment. Stopping smoking may also mean your cancer is less likely to come back after treatment.
If it isn’t possible to cure your cancer, your treatment will aim to extend your life and improve your quality of life as much as possible. This is called palliative care.
Surgery
Your surgeon may remove a small section, part of a lung or a whole lung, depending on the size, type and position of your cancer. Whether or not you’re offered surgery also depends on how healthy your lungs are to start with.
If you’re going to have surgery, stopping smoking before your operation will help you recover better afterwards. Before surgery, you may be given some advice on how to get yourself as fit as possible so you’re ready for your operation.
Non-surgical treatments
Radiotherapy uses radiation to destroy cancer cells. Your doctor will target a beam of radiation onto the area of your lung with the cancer to shrink the tumour. You may have radiotherapy if you have NSCLC but you aren’t well enough for surgery. You may also have radiotherapy with chemotherapy, especially if you have SCLC.
Chemotherapy uses medicines to destroy cancer cells. You may have chemotherapy on its own, after surgery or with radiotherapy. Chemotherapy is usually given as an injection or through a drip.
Targeted therapies are medicines that can block messages in your cancer cells to stop them growing and dividing. They’re also called biological therapies and usually come in the form of tablets. You may be offered targeted therapy if you have a particular type of NSCLC.
Immunotherapy is a newer type of cancer treatment, which helps your immune system to attack cancer cells. A number of immunotherapy drugs are now available to treat advanced NSCLC.
All lung cancer treatments can help to manage your cancer, but they can also cause side-effects. Your doctors and nurses will give you information about the treatments. This will help you decide which treatment is right for you and what to expect. Everyone is different and the effects of the treatments vary from person to person.
Causes of lung cancer
Smoking is the biggest cause of lung cancer, causing around nine in every 10 cases. Your risk of lung cancer is related to how much you smoke, how long you’ve been smoking and when you started smoking. It also depends on which type of cigarettes you smoke. Smoking unfiltered cigarettes and high-nicotine cigarettes increases your chances of getting lung cancer. Passive or second-hand smoking (breathing in other people’s smoke) is also linked to the disease.
You may also be more likely to get lung cancer if you:
- are exposed to asbestos
- are exposed to high levels of radon gas – a naturally occurring radioactive gas
- have had lung disease, such as tuberculosis (TB) or chronic obstructive pulmonary disease (COPD), in the past
Looking for cancer cover that supports you every step of the way? If you develop new conditions in the future, you can rest assured that our health insurance comes with full cancer cover as standard. Find out more about Bupa health insurance >
Looking for cancer cover that supports you every step of the way?Prevention of lung cancer
The most important thing you can do to reduce your risk of developing lung cancer is to stop smoking. Speak to your local pharmacist or GP about the best ways to give up smoking. Using nicotine replacement therapy (such as gums or patches) can help you quit. Vaping is also considered safer than smoking and may be an option for you to consider, although quitting completely is still best.
Try to avoid second-hand smoke – keep away from enclosed spaces where other people are smoking. Try to avoid exposing yourself to anything at work that could increase your risk of lung cancer, such as asbestos or radiation.
There’s some evidence that eating fruits and vegetables can help to reduce your risk of getting lung cancer if you’ve never smoked. So try to eat a balanced diet with at least five portions of fruit and vegetables every day. Taking dietary supplements doesn’t seem to have any effect on the risk of lung cancer and may even be harmful.
Being more physically active may help to reduce your chance of getting several cancers.
Living with lung cancer
Being diagnosed with cancer can be distressing for you and your family. An important part of cancer treatment is getting enough support to deal with the emotional aspects as well as the physical symptoms.
Your doctors and nurses will help to support you through your treatment. They can prescribe medicines and offer practical advice to deal with any symptoms you may have such as pain, exhaustion, breathlessness, coughing, anxiety and depression.
Your hospital should also offer a range of helpful services, including dietitians, counsellors, complementary therapists and benefits advisers. Lots of therapies can be useful, including art, music, drama and relaxation. Voluntary groups and patient organisations, such as Macmillan nurses and Marie Curie nursing and day centres, are also available.
It’s important to share your feelings and talk about any worries you have. Your specialist cancer doctors and nurses are experts in providing the support you need. You should have a key worker assigned to you as soon as you’ve been diagnosed.
If you can, take a friend or relative with you to your hospital appointments. Make sure you understand the pros and cons of every treatment and that you’re in charge of making your own decisions. Don’t rush into making a decision until you’re sure about it.
Encourage your family and close friends to get support and talk about their feelings too. Caring for someone with cancer can be very stressful.
If you have more advanced cancer, you can get support through hospices or at home. Your doctor will discuss this with you.
-
How can I find out about new lung cancer treatments?
You may hear or read about new cancer treatments in the news, but many of these are still in the experimental stages. All new treatments need to go through several clinical trials to check that they’re safe and work properly before they can be used on everyone. If you do read any media reports of new treatments, discuss these with your cancer specialist.
You may be able to join a local clinical trial. But you’d need to be referred by your cancer specialist. They’ll know if you’re right for the trial and if the treatment being tested could be right for you. Each clinical trial will have strict guidelines. They may be looking for people with a certain type of cancer, of a certain age or at a particular stage in their illness.
You can find out more about clinical trials happening near you on the Cancer Research UK website.
-
What is hospice care?
If your cancer can't be cured, hospices can help to support you and your family. They tend to be comfortable and homely – smaller and quieter than a hospital. They aim to look after you as a whole person and support those who care for you.
The doctors and nurses in a hospice can give you specialist care for any symptoms from advanced cancer, such as pain and breathing problems. They may also offer complementary therapies and counselling, as well as practical and financial advice.
You may not need full-time hospice care. A hospice can support you if you’re living at home or in a care home too. Your GP may be able to arrange a short stay in a hospice for you to give your carers a break.
Your GP or specialist cancer nurse can tell you about hospices in your local area. You may be referred to the hospice team fairly early in your treatment. Although you may not ever need to go to the hospice, the doctors and nurses there are experts in symptom control and can help support you and your family.
-
How active can I be after lung cancer surgery?
It's important to get yourself fit again as soon as possible after your lung cancer surgery. This should help you to recover more quickly. The nurses and physiotherapists in the hospital will encourage you to be up and walking a little as soon as possible after your surgery. But it’s normal to feel tired for several weeks or even months afterwards.
Everyone recovers differently from surgery. So before you leave the hospital, ask your doctor or physiotherapist how active you should aim to be.
- Take it slowly at first and don't do too much.
- Space out your activities during the day and listen to what your body is telling you.
- Do a bit more each day and rest when you need to.
- Walk around the house at first and then build up to going outside.
Did our information help you?
We’d love to hear what you think. Our short survey takes just a few minutes to complete and helps us to keep improving our health information.
About our health information
At Bupa we produce a wealth of free health information for you and your family. This is because we believe that trustworthy information is essential in helping you make better decisions about your health and wellbeing.
Our information has been awarded the PIF TICK for trustworthy health information. It also complies with the HONcode standard and follows the principles of the The Information Standard.
 |
 |
|---|
Related information
Adjusting after your treatment
A cancer survivor is somebody who lives with or beyond their cancer.
Common cancer words
Medical terms can be confusing so we’ve put together a list of some common cancer terms with explanations of what they mean.
Effects of smoking
Here we give you the facts about the harm smoking does to your body and advice on how to quit.
-
Other helpful websites
- Macmillan Cancer Support
0808 808 0000
www.macmillan.org.uk - Marie Curie
0800 090 2309
www.mariecurie.org.uk - Cancer Research UK
0808 800 4040
www.cancerresearchuk.org - British Lung Foundation
0300 0030 555
www.blf.org.uk - Roy Castle Lung Cancer Foundation
0333 323 7200
www.roycastle.org
- Macmillan Cancer Support
-
Sources
- Thoracic malignancies. Oxford Handbook of Oncology. 4th ed. Oxford Medicine Online. oxfordmedicine.com, published online October 2018
- Lung cancer. Patient. patient.info, last reviewed February 2017
- Lung anatomy. Medscape. emedicine.medscape.com, updated December 2017
- Chest medicine. Oxford Handbook of Clinical Medicine. Oxford Medicine Online. oxfordmedicine.com, published online September 2017
- Lung anatomy. Medscape. emedicine.medscape.com, updated December 2017
- Lung cancer statistics. Cancer Research UK. www.cancerresearchuk.org, accessed March 2020
- Small cell lung cancer. BMJ Best Practice. bestpractice.bmj.com, last reviewed February 2020
- Lung carcinoma. The MSD Manuals. www.msdmanuals.com, last full review/revision March 2018
- Lung and pleural cancers – recognition and referral. NICE Clinical Knowledge Summaries. cks.nice.org.uk, last revised November 2016
- Cough. NICE Clinical Knowledge Summaries. cks.nice.org.uk, last revised June 2015
- Chowienczyk S, et al. Changes in the presenting symptoms of lung cancer from 2000–2017: a serial cross-sectional study of observational records in UK primary care. Br J Gen Pract 2020; doi:10.3399/bjgp20X708137
- Cough (acute): antimicrobial prescribing. National Institute for Health and Care Excellence (NICE), Guideline NG120, February 2019. www.nice.org.uk
- Suspected cancer: recognition and referral. National Institute for Health and Care Excellence (NICE), Guideline NG12, July 2017. www.nice.org.uk
- Management of lung cancer. Scottish Intercollegiate Guidelines Network (SIGN), SIGN 137, 2014. www.sign.ac.uk
- Computerised tomography (CT) scans. Patient. patient.info, last reviewed July 2015
- Transthoracic needle biopsy. Medscape. emedicine.medscape.com, updated December 2019
- Non-small cell lung cancer. BMJ Best Practice. bestpractice.bmj.com, last reviewed February 2020
- Chest medicine. Oxford Handbook of Geriatric Medicine. 3rd ed. Oxford Medicine Online. oxfordmedicine.com, published online February 2018
- Surgery. Oxford Handbook of Adult Nursing. 2nd ed. Oxford Medicine Online. oxfordmedicine.com, published online June 2018
- Principles of radiation oncology. Oxford Handbook of Oncology. 4th ed. Oxford Medicine Online. oxfordmedicine.com, published online October 2018
- Therapy-related issues: malignant diseases and immunosuppression. Oxford Handbook of Clinical Pharmacy. 3rd ed. Oxford Medicine Online. oxfordmedicine.com, published online April 2017
- Targeted and biological therapies. Oxford Handbook of Oncology. 4th ed. Oxford Medicine Online. oxfordmedicine.com, published online October 2018
- Nivolumab for previously treated non-squamous non-small-cell lung cancer. National Institute for Health and Care Excellence (NICE), Technology Appraisal Guidance TA484, November 17. www.nice.org.uk
- Nursing patients with cancer. Oxford Handbook of Adult Nursing. Oxford Medicine Online. 1st ed. oxfordmedicine.com, published online August 2010
- Respiratory medicine. Oxford Handbook of General Practice. Oxford Medicine Online. oxfordmedicine.com, published online April 2014
- Non-small cell lung cancer. Medscape. emedicine.medscape.com, updated August 2019
- Smoking cessation. NICE Clinical Knowledge Summaries. cks.nice.org.uk, last revised March 2018
- ASH research report: secondhand smoke. Action on Smoking and Health (ASH). ash.org.uk, published March 2014
- Aetiology and epidemiology. Oxford Handbook of Oncology. 4th ed. Oxford Medicine Online. oxfordmedicine.com, published online October 2018
- Palliative care. Patient. patient.info, last reviewed January 2019
- What is a clinical trial? MRC Clinical Trials Unit. www.ctu.mrc.ac.uk, last updated November 2018
- How to find a clinical trial. Cancer Research UK. www.cancerresearchuk.org, last reviewed February 2019
- How can you take part in a trial? MRC Clinical Trials Unit. www.ctu.mrc.ac.uk, last updated November 2018
- What is hospice care? Hospice UK. www.hospiceuk.org, accessed March 2020
- Choosing where to die. Cancer Research UK. www.cancerresearchuk.org, last reviewed February 2019
- What services are on offer? Hospice UK. www.hospiceuk.org, accessed March 2020
- After surgery. Cancer Research UK. www.cancerresearchuk.org, last reviewed October 2019
- Lung resection. Royal College of Surgeons. www.rcseng.ac.uk, accessed March 2020
-
Author information
Reviewed by Victoria Goldman, Freelance Health Editor, and Marcella McEvoy, Bupa Health Content Team
Expert reviewer, Dr Adam Dangoor, Consultant Medical Oncologist
Next review due April 2023
Legal disclaimer
This information was published by Bupa's Health Content Team and is based on reputable sources of medical evidence. It has been reviewed by appropriate medical or clinical professionals and deemed accurate on the date of review. Photos are only for illustrative purposes and do not reflect every presentation of a condition.
Any information about a treatment or procedure is generic, and does not necessarily describe that treatment or procedure as delivered by Bupa or its associated providers.
The information contained on this page and in any third party websites referred to on this page is not intended nor implied to be a substitute for professional medical advice nor is it intended to be for medical diagnosis or treatment. Third party websites are not owned or controlled by Bupa and any individual may be able to access and post messages on them. Bupa is not responsible for the content or availability of these third party websites. We do not accept advertising on this page.
For more details on how we produce our content and its sources, visit the 'About our health information' section.
^We may record or monitor our calls
