After you roughly bump part of your body—say your shin or your "funny bone"—into something and experience pain as a result, you may to decrease that sense of pain by rubbing the injured area. the provides some insight as to why rubbing the area to lower the pain that you feel.

Gate theory                                        

Explanation:

Gate theory: The gate control theory of pain is developed by Patrick Wall and Ronald Melzack. This theory is referred to as the scientific theory that explains the psychological aspect of pain. The theory describes the pain as the outcome of the stability between the information passing through small and large nerve fibers into the spinal cord. It signifies the absence of pain because the gate is closed.

Melzack and Wall suggested that to rub injuries after they happen because that closes the gate and hence diminishes the pain.

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