Most hair stylists/shampooers do very vigorous scalp massages when washing hair in a salon, so I wouldn't think that massaging would cause hair loss or they wouldn't do it. Now if you are scratching the scalp with fingernails or really pulling at the hair, then yes, that would cause some hair loss.
Maybe it's more an issue of an ingredient the hair doesn't like or a health issue?
--I'm located in Western PA.
--I found NC in late 2004, CG since 2-2005, started going grey in late 2005.
--My hair is 3B with some 3A, texture-medium/fine, porosity-normal except for the ends which are porous, elasticity-normal.
--My long time favorite products are Suave & VO5 conditioners, LA Looks Sport Gel, oils, honey, vinegar.
--My CG and grey hair progress --