The dividing line between the two areas is not necessarily easy to draw. Wellness is a fashion movement, a product of the zeitgeist, which is largely based on it, that many people today find their everyday life overwhelming and stress-dominated; the ideological background of this movement is therefore particularly important for many people, to make time for yourself, without having a bad conscience, which is due to unfinished work during this period or similar unpleasant factors, to have to deal with.
Medical wellness, on the other hand, is an even more recent branch of this fad, which, however, comes with greater seriousness and a firmer practical foundation. While you can only sell products that make sense to a limited extent, such as a foot massager, as a real "wellness item"., "medical wellness" is based on the knowledge and practical experience of alternative medicine, which is a real bone of contention in the medical establishment, but which undoubtedly has its advantages and can show great success. There is absolutely nothing wrong with that, to let yourself go really well in the sense of "normal" wellness; however, one wants eventual physical ailments, where a psychosomatic background can be assumed, combat effectively, one should rather stick to the findings and practices of medical wellness.
If you are interested in this large and growing field, you can read more about it in the relevant section.