10 Cancer Symptoms Women Shouldn't Ignore : Symptom No. 9 : Fatigue

You don't need to panic, but you shouldn't assume these signs are 'nothing,' either. Plus three ways to lower your risk.

9. Fatigue

The American Cancer Society defines fatigue as "extreme tiredness that does not get better with rest." So if you're often fatigued, see your doctor. Leukemia, colon, or stomach cancer -- which can cause blood loss -- can result in fatigue.

"Fatigue can be a serious problem and it's easy to ignore," Runowicz says. 

Your doctor will most likely do a physical exam and order blood tests to check your thyroid and rule out a thyroid condition, she says.