We say that “it is all connected”, but do we really believe this?

So often in medicine we separate the systems.
We identify and treat injuries, illnesses and disorders as unidimensional, singularly occurring, and of only directly related causality.

We say that “it is all connected”, but do we really believe this?
In a practical way?
And if we do, do we fully appreciate the depth of this connectedness going beyond physical structures?

If the connection is more than physical, it must then encompass our emotions.
But “emotions” are not something easily recognized by science, although an extensive body of research exists showing that emotions do in fact have a molecular basis and follow a biological process!

Take, for example, the effect of morphine on pain.
Morphine is a peptide that binds to an opioid receptor which blocks neurotransmission of pain.
What type of emotions are elicited by the sensation of pain?
Anger, frustration, despair?
And so we see the connection: physical pain affects our emotional response.

Another example would be endorphins.
Endorphins are known to cause feelings of happiness and an overall good mood. They are also a type of neuropeptide that bind to a specific receptor - a physiological and biochemical pathway between the body and the brain!