Pain varies from person to person, even if they are diagnosed with the same issue. The pain a patient is in can’t be diagnosed the same as an illness can, because it is difficult to measure. Researchers have started using brain scans to get a closer look at what goes on within someone when they experience excessive and chronic pain. Chronic pain is especially difficult to treat, with different methods often not working for everyone. Understanding where the pain comes from and what is causing it can often help provide better insight on how to best treat it, rather than just prescribing pain killers.