And something that can cause either or both (hyporreflexia/hyperreflexia) is B12 deficiency. I can personally vouch for both being possible in the same person. By the time I was diagnosed by the neurologist I finally got to, I had hypo in my elbows and hyper in my knees).

Both are also mentioned in a very long list of possible signs and symptoms, in an unusually accurate (not decades out of date on the B12 subject) medical textbook. Goldman: Cecil.

rose