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People have been urged to see their GP if they experience a symptom lasting three weeks or longer. According to the NHS, a cough that persists for this length of time could be caused by a deadly disease that kills around 33,100 Brits every year. 
Coughs are a common ailment that many people suffer from throughout the year. They can be a sign of a seasonal illness such as a cold, flu or even Covid. 
They may also be triggered by hay fever, allergies or exposure to irritants like dust or smoke. However, in certain instances, they could signal a more serious issue. 
In a recent post on social media platform X, the NHS cautioned that a cough persisting for over three weeks could potentially be a symptom of lung cancer. According to Cancer Research UK, this

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