system
Given the following post, respond as if you're commenting on Reddit:
human
When you get cancer, is most of the pain focused on the area that you have cancer in? Or does the pain spread out across the body regardless of the origin of cancer?

I understand that the pain is, in general, throughout the body. However, is it "more" painful in the specific area that the cancer originated? For example, would colon cancer have more pain in the colon area than the rest of the body?
gpt
Excepting brain cancer, pain in cancer is frequently due to disruption of the normal anatomy which produces local pain that may be so severe or vague it feels like it’s spreading. For example, liver cancer can stretch out the sac that surrounds the liver (its capsule) and produce excruciating pain, but since the nerves inside your body aren’t as god at locating pain as the ones in your skin, the brain could misattribute that pain to pretty much the whole belly. As another example, bony metastases from prostate cancer usually cause pretty bad local pain in the bone they’re invading, which is worsened by injury to said weakened bone.