Dysphagia (difficulty swallowing) may indicate lung cancer, according to Roy Castle Lung Cancer Foundation, Express.co.uk reports.
This can lead to loss of weight and dehydration, and can be very distressing.
Like all cancers, early diagnosis is paramount to improving survival outcomes. Unfortunately, the cancer is not usually picked up until it has advanced.
Occasionally pain or a burning sensation can be experienced when swallowing, it adds.
Other symptoms include a cough that doesn’t go away after two or three 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, persistent tiredness or lack of energy, loss of appetite or unexplained weight loss.
There can be no widespread vitamin deficiency in a civilized, prosperous country where citizens eat well, Russian allergist-immunologist Aleksey Bessmertny said, NEWS.ru reported earlier.