16. Unusually heavy or painful periods, bleeding between periods

A common sign of endometrial or uterine cancer. A transvaginal ultrasound should be considered if the problem persists.
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17. A chronic cough or chest pain

Leukemia and lung tumors (among others), show symptoms that can mimic a bad cough or bronchitis. Some patients also reported chest pain that extended to the shoulder and down their arms.