20 Warning Signs Of Cancer You Should Never Ignore!

3.  Unusual Shortness of Breath

When you don’t have enough oxygen in the blood, you feel short of breath. Your body will be starved for oxygen; to overcome this, it’ll make your lungs and heart work overtime, making you breath more.
This shortness of breath could be a sign of lung cancer or leukemia as your lungs or blood cells are not working to their capacities.