Cancer is a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body. These contrast with benign tumors, which do not spread.
Cancer can start almost anywhere in the human body, which is made up of trillions of cells. Normally, human cells grow and multiply (through a process called cell division) to form new cells as the body needs them. When cells grow old or become damaged, they die, and new cells take their place.
Although every case is different, some general signs and symptoms of cancer include: Weight loss Unexplained weight loss of 10 pounds or more may be one of the first signs of cancer. Weight loss is common in people who have pancreatic, stomach, esophageal, or lung cancer, but can occur with any type of cancer.
Testing is recommended up through age 75. People aged 76 to 85 should talk with their health care provider about whether continuing screening is right for them. Most people older than 85 should no longer be screened. If you are being screened, there are many testing options.