The main symptoms of lung cancer include:
• a cough that doesn’t go away after 2 or 3 weeks
• a long-standing cough that gets worse
• chest infections that keep coming back
• coughing up blood
• an ache or pain when breathing or coughing
• persistent breathlessness
• loss of appetite or unexplained weight loss
Less common symptoms of lung cancer include:
• changes in the appearance of your fingers, such as becoming more curved or their ends becoming larger (this is known as finger clubbing)
• difficulty swallowing (dysphagia) or pain when swallowing
• wheezing & a hoarse voice
• swelling of your face or neck
• persistent chest or shoulder pain
Smoking:
Smoking cigarettes is the single biggest risk factor for lung cancer. It's responsible for more than 70% of cases. Tobacco smoke contains more than 60 different toxic substances, which are known to be carcinogenic (cancer-producing). If you smoke more than 25 cigarettes a day, you are 25 times more likely to get lung cancer than a non-smoker.
Courtesy: NHS