Benign Fasciculation Syndrome (BFS) is a fancy term that refers to neurological twitching that apparently isn’t harmful and has no apparent cause. I run a group on Facebook called “Benign Fasciculation Syndrome – Holistic Approaches.” We are always trying to figure out why we are twitching! Many of the people in this group have reported symptoms of Mast Cell Activation Syndrome (MCAS), which is basically the body overproducing mast cells, which kind of serves to be an ongoing allergic reaction of sorts. An autoimmune disorder is when the body is attacking itself, confusing body cells and tissues as a foreign invader. These two syndromes may be related.