The initial signs of cancer vary depending on the type, but they commonly include weight loss and fatigue. Dizziness and weakness are also common signs of cancer, according to the American Cancer Society.
The signs and symptoms that are present with cancer often depend on the location of the cancer and whether it has spread to other parts of the body. For instance, pancreatic cancer can grow large enough to press on neighboring veins or organs which can cause stomach pain. It can also cause problems with bile and bowel movements. Those experiencing troublesome symptoms or who are worried about cancer should contact their doctors.