5. Pain
If any part of your body, be it internal or external reacts in terms of pain; your brain is being signaled with the message that those organs of your body needs to be taken care of. Headaches and back pain are very common, in this case. Pain that goes beyond your ability to control is a sign of bone or testicular cancer.
The increase in pain justifies the fact that cancer is spreading from the place it took birth to the rest of the areas in your body. However, if the pain is more excruciating as headaches, brain tumor is a possible sign that can lead to cancer. Back pain symptoms can go from colon cancer to cancer at the ovaries. Rectum cancer is also very common among those who experience continues back pain.