2. Unexplained Weight Loss
Dropping 10 pounds or more without changing your diet or exercise habits is considered a red flag across virtually every cancer screening guideline. Unexplained weight loss is particularly associated with cancers of the pancreas, stomach, esophagus, and lung. Cancer cells consume energy and alter metabolism, leading to weight loss even when appetite seems normal.
Cancer uses the body’s nutrients to grow and advance, so those nutrients are no longer replenishing the body. This “nutrient theft” can cause extreme fatigue alongside weight loss. If you notice this combination — unexplained weight loss paired with tiredness — that’s a reason to seek medical evaluation without delay.