2. PAIN

Most of the time, the occurrence of pain indicates the degree to which cancer cells have spread in the body. For some cancers such as bone or testicular cancer, however, pain can be an early symptom and the cancer can be beaten if detected this early on. Back pain can also be an early sign of colorectal, pancreatic, or ovarian cancer.

For headache complaints that don’t go away, those can be a sign of brain tumors. Pain can be from cancer itself or because the tumor is growing and causing a reaction in other organs. But it can also be the body’s reaction to chemicals that cause the pain.