Lung cancer is one of the most common and serious types of cancer.
Around 44,500 people are diagnosed with the disease every year in the UK, according to the NHS.
There are usually no signs or symptoms of lung cancer in the early stages, but many people will eventually develop symptoms.
A persistent cough that doesn’t go away after two or three weeks, or a long-standing cough, could be signs of the disease.
In most cases, a persistent cough will be caused by something else, such as a chest infection, and is very rarely a sign of lung cancer.
However, if present with other symptoms, there is still a risk it could be lung cancer so it’s always best to get it checked out.
Other main symptoms of lung cancer include persistent chest infections, coughing up blood, an ache or pain when breathing or coughing, persistent breathlessness, persistent tiredness and loss of appetite or unexplained weight loss.
If you experience any of those symptoms, see your GP, advises the NHS.
Less common symptoms of lung cancer include finger clubbing, fever, difficulty or pain when swallowing, wheezing, a hoarse voice, swelling of the face or neck and persistent chest or shoulder pain.
“Lung cancer often doesn’t cause symptoms until it has spread through the lungs or into other parts of the body,” said the NHS.
“This means the outlook for the condition isn't as good as many other types of cancer.”
About one in three people with lung cancer live for at least a year after diagnosis, while around one in 20 live for at least 10 years.
However, survival rates can vary widely, depending on how far the cancer has spread at the time of diagnosis.
“Early diagnosis can make a big difference,” said the NHS.
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Lung cancer mainly affects older people and is rare in people under the age of 40.
It’s most commonly diagnosed in people aged 70 to 74.
Although people who have never smoked can develop lung cancer, smoking is the main cause of the disease, accounting for over 85 per cent of cases.
This is due to the toxic substances inhaled while smoking. According to the NHS, tobacco smoke contains more than 60 different toxic substances.
These substances are known to be carcinogenic, which means they produce cancers.
If you smoke more than 25 cigarettes a day, you are 25 times more likely to get lung cancer than a non-smoker, according to the NHS.