Is low blood pressure a sign of end stage if one is diagnosed with bilateral lung cancer?

How do they FEEL?: The course in lung cancer is famously unpredictable, especially if it is non-small-cell. One's blood pressure need be only high enough to perfuse the body -- it'd be a shame for a person who simply needs a few glasses of water to say, "Oh, my pressure is low, the end must be near." I hope that in the end, the person about whom you are writing is able to pass on with comfort and dignity.