https://journals.sagepub.com/doi/10.1177/1352458517739975#articleShareContainer : the best idea I ever read on mulltiple sclerosis. As a writer, I would like to extrapolate it. Serotonin being the "happiness" hormon, could it be lesions in the brain to be due to "unhappiness", I mean brusc drops down of levels of serotonin in the brain, that don't allow anymore the normal brain functions to be performed, leading to a lesion. More generally, could it be a feeling harms brain tissue?