That’s why it’s important to know your skin and regularly check for any changes in moles, freckles, or other skin marks, according to the American Cancer Society (ACS).

Other signs of skin cancer include:

• Flat, firm areas that look a lot like a scar
• Rough or scaly red patches that might itch
• Raised growths or bumps that might be pink, red, or pearly looking
• Wart-like growths on skin that's been exposed to the sun a lot, like your face, ears, or hands

Other signs of melanoma include:

• One half of a mole that doesn't match the other half
• A mole with edges that are ragged, notched, or blurred
• The color of a mole is uneven or changing
• A mole that's larger than a pencil eraser

See a doctor right away if you have any of these symptoms, the ACS says.

In most cases of testicular cancer, the man has a lump on a testicle or notices that the testicle is swollen, according to the ACS. The ACS recommends that a testicular exam be included as part of a man's general health checkup. See your healthcare provider if you notice any changes in your testicles.

A change in bowel habits is a symptom of colon and rectal cancer. Other symptoms include rectal bleeding, abdominal cramping, and weight loss. Stomach cancer doesn't usually cause symptoms early in the disease. It may cause belly pain, nausea, or a feeling of "fullness" after eating only small amounts of food.

Mammography is an important tool for finding breast cancer early, when it’s small and easiest to treat. But the benefits and limits of mammography vary based on things like age and personal risk. Experts have different recommendations for mammography. For those at average risk, the ACS recommends yearly screening for all women ages 45 to 54. Screening can continue to be done yearly, or can be done every 2 years for women ages 55 and older. Women should talk with their healthcare provider about their personal risk factors before making a decision about when to start getting mammograms or how often they should get them. All women should know how their breasts normally look and feel and report any changes to a healthcare provider.

Other possible signs are chest pain that's worse with coughing or deep breaths and increased sputum or blood in the sputum. These symptoms could be caused by something other than cancer, but be sure to have any of these checked out by your healthcare provider.

Signs of advanced prostate cancer include trouble passing in urine, back pain, trouble getting an erection, and blood in the urine or semen.

These are the most common signs of mouth or tongue cancer. These cancers are mostly found in people who smoke, chew tobacco, or both. Regular dental checkups that include a whole mouth exam can help find these cancers early, according to the ACS.

The most common symptoms are blood in the urine or changes in bladder habits, according to the ACS. These could be signs of other health problems, but be sure to tell your healthcare provider if you notice changes.