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If you lose more than 5–10% of your body weight in a short period without dieting or exercise, it may be a red flag. Many cancers, especially those of the stomach, pancreas, and lungs, cause rapid weight loss.
3. Persistent Pain
Chronic pain that lingers without an obvious cause should be taken seriously. For example:
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Headaches that don’t respond to treatment may relate to brain tumors.
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