For Women Only: Cancer Symptoms You're Most Likely to Ignore

3. Swallowing problems or hoarseness

Most commonly associated with esophageal or throat cancer, difficulty swallowing is sometimes one of the first signs of lung cancer, too. A hoarse or low, husky voice or the feeling of something pressing on the throat can be an early indicator of thyroid cancer or a precancerous thyroid nodule, as can the feeling of having something stuck in your windpipe.

4. Frequent fevers or infections

These can be signs of leukemia, a cancer of the blood cells that starts in the bone marrow. Leukemia causes the marrow to produce abnormal white blood cells, which crowd out healthy white cells, sapping the body's infection-fighting capabilities. Often, doctors diagnose leukemia only after the patient has been in a number of times complaining of fever, achiness, and flu-like symptoms over an extended period of time.

5. Swollen lymph nodes or lumps on the neck, underarm, or groin

Enlarged lymph nodes indicate changes in the lymphatic system, which can be a sign of cancer. For example, a lump or an enlarged lymph node under the arm is sometimes a sign of breast cancer. A painless lump on the neck, underarm, or groin can be an early sign of leukemia.