Since palpitations are a rare warning sign, doctors recommend being alert to lookout for other warning signs of the disease as well. These can include a chest infection that persists, coughing up blood, or an ache when breathing and coughing. Loss of appetite, weight loss for no known reason, fatigue and trouble swallowing are also symptoms of lung cancer.
Clubbing of the fingers also occurs in 35 percent of people with non-small cell lung cancer. In this, the ends of the fingers swell up in stages. First, the base of the nail becomes soft and the skin around the nail bed becomes shiny. Next, the nails begin to curve more than normal. Finally, the ends of the fingers swell, caused by fluid collecting in the soft tissues of the fingers.