The body adds: “First, the base of the nail becomes soft and the skin next to the nail bed becomes shiny.

“Next, the nails begin to curve more than normal when looked at from the side.

“Finally, the ends of the fingers may swell; it’s thought to be caused by fluid collecting in the soft tissues of the fingers.”

What causes lung cancer?

Lung cancer typically occurs when a cancer-causing agent triggers the growth of abnormal cells in the lung, according to Harvard Health.

In most lung cancer cases, the carcinogen that prompts tumour growth is cigarette smoke.

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