Constant Fatigue And Weakness
Since you are always feeling exhausted despite taking a rest, this may be an early sign of lung cancer. The immune system and energy levels of the body may be altered by cancer, causing a person to feel constantly tired and weak. This form of fatigue does not have the same meaning as being tired. It never gets better with sleep and can disrupt the everyday routine. Fatigue is something that is disregarded by most people as they assume that it is caused by work stress or insomnia, however, continued fatigue is something that warrants medical care.
