Our bodies are amazing communicators and are designed to inform us with discomfort when something is off. This can be physically, mentally, spiritually, and/or emotionally. Because we are not just physical beings, when one of the other bodies is out of balance or lacking the body will cry out in physical pain.
A good example of this is someone with any type of abuse or trauma (Post traumatic stress disorder) developing chronic pain. Most people with chronic pain have some sort of suppression of feelings or emotions going on. Many people that have childhood abuse or neglect develop chronic pain. We live in a society were we distract ourselves and suppress pain and trapped emotions will cause the body to scream out it REAL PHYSICAL PAIN.