Unlikey: Small cell lung cancer is not subtle. This would be way down on my list of possibilities, along with other paraneoplastic GI syndromes. With fatigue, weight loss, and a rumbling gut, I'd check you for malabsorption / maldigestion, gluten enteropathy, maybe Whipple's, Crohn's, giardiasis, pancreatic insufficiency from tumor / adult onset cystic fibrosis, a few others.
Answered 6/19/2016
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