NHS warns of serious health risks from coughs lasting over three weeks

The NHS warns that a cough lasting more than three weeks may signal a serious health issue, including lung cancer, which causes about 34,800 deaths annually in the UK. Common causes of coughs include colds and allergies, but persistent coughing can indicate more severe conditions. The NHS advises seeking medical help if symptoms like blood in the cough, weight loss, or breathlessness occur. Smoking is the leading risk factor for lung cancer, responsible for over 70 percent of cases. Other risks include exposure to radon and asbestos. The NHS recommends consulting a GP for persistent symptoms.