National Standards: Out-of-Pocket Health Care. Disclaimer: IRS Collection Financial Standards are intended for use in calculating repayment of delinquent taxes. These Standards are effective on March 28, 2016 for purposes of federal tax administration only.
The chemicals released by the body when an injury occurs or when the body has other abnormal processes taking place actually make changes to the nervous system. The types of changes they make are related to the type of pain you feel.
Pain is the unpleasant sensory experience due to nerve or tissue damage. Pain may be a result of: 1  Injury-from a trauma (such as from falling down, a car accident). 2  Tumor invasion-A cancerous tumor may have invaded nerves, an internal organ (such as the liver or lung), or your bones, and caused pain. 3  Blood clots-in your legs, or in your lungs may have damaged nerve or tissue.