Lung cancer is one of the most common types of cancer in the UK, according to the NHS.
Almost 45,000 people are diagnosed with lung cancer every year in the UK.
The cancer usually affects people between 70 and 74 years old, and is rare in anyone under 40.
Lung cancer symptoms are often difficult to spot during its early stages, but they gradually appear as it develops.
One of the signs of lung cancer is a persistent pain in the chest, it added.
Chest pain could be a sign of lung cancer and should be checked by a doctor straight away.
It’s one of the more serious symptoms of lung cancer, but chest pain could be caused by a number of less serious conditions.
It could be caused by heartburn, anxiety, a chest sprain or even a chest infection, the NHS said.
Bupa added: “Many symptoms of lung cancer, such as a cough, can also be symptoms of other much less serious conditions, such as asthma.
“But if you’ve had symptoms such as a cough or feeling very tired for longer than three weeks, contact your GP surgery for advice.
“Some of the more serious symptoms above – such as increasing shortness of breath, chest pain and coughing blood – should be checked by a GP sooner rather than waiting three weeks.
“If you’re in any doubt, it’s best to see you GP as soon as you can.”
One of the most common signs of lung cancer is a cough that doesn’t go away, or seems to get worse over time.
Coughing up blood, feeling short of breath or having regular chest infections may be signs of the disease, Bupa warned.
Other less common symptoms could include a swollen face or neck, a hoarse voice, or a thickening of the fingertips.
If you’re a smoker, the best way to lower your risk of lung cancer is to quit smoking.
Every year you don’t smoke lowers your risk of getting life-threatening conditions, the NHS said.
After 10 years smoke-free, your risk of lung cancer is half that of someone that still smokes.
You could also prevent lung cancer by sticking to a healthy, balanced diet.
Aim for a low-fat, high-fibre diet, including at least five portions of fresh fruit and vegetables a day.