When people are stressed for a long time—overaroused—they seem to run low on certain neurotransmitters. (Other things, like certain viruses, will also reduce these important brain juices.) Once low on them, some people stay low: depressed. But not everyone does, and why that is the case is not yet known. And being an HSP does not automatically mean you are more prone to depression. Long-term overarousal is the culprit.
