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.
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.
18. Pelvic/Abdominal pain

Pain and cramping in the pelvis can be linked with the bloating signs of ovarian cancer. Leukemia also does this because it enlarges the spleen.
19. Pain in the back or lower right side

Often an early sign of liver cancer. Breast cancer can also be found through this as a breast tumor can press back into the chest or spread to the spine/ribs.
20. Upset stomach

Stomach cramps or a frequently upset stomach can be a sign of colorectal cancer.
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