Unfortunately, many types of cancer don't have obvious symptoms or cause pain until they are advanced. Because early-stage cancer symptoms tend to be subtle, they are often mistaken for signs of other health issues.

Seven warning signs of cancer

• Changes in bowel or bladder habits
• A sore that does not heal
• Unusual bleeding or discharge
• Thickening or a lump in the breast or any other part of the body
• Indigestion or difficulty swallowing
• An obvious change in a wart or mole
• A nagging cough or hoarseness

Consult your physician if you have any of these signs and symptoms.