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.
This causes pain, nausea and muscle tightness in the chest -- hence the feeling that your heart is heavy, or those sharp pains when you see your crush with someone else. So essentially, your brain sends a message to a nerve. The nerve responds by making your muscles tighten in your chest. It feels like your heart is heavier, or that you're in pain, or both. When you stop being sad, your brain stops sending the message.