20 Unexpected Signs and Symptoms of Lung Cancer

6. Digestive problems

Increasing level of calcium in blood is a sign of lung cancer. A high level of calcium in the blood leads to digestive problems, like stomachache, constipation, or nausea.

7. Heart problems

High calcium level and anemia can cause many heart problems, including a rapid heartbeat, or irregular heartbeat. Even worse, it will cause extremely serious heart problems, for example, a heart attack or a coma.

8. Persistent cough

One of the most common signs of lung cancer is a persistent cough for over 3 weeks. Be careful when your phlegm appears to be bloody or pink. Consult your doctor in time.