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Hello Ashley,    What an intriguing but nonenetheless very important question.   ( Comment made by me as a non expert but 'very interested' retired doc, non psych.)   Firstly  I would suggest that any immediate physical harm arising to the individual  actually experiencing the hallucination,would most likely occur secondary to powerful fear induced reflex responses ( 'flight or fight') triggered by (eg one scenario ):a scary threatening apparition. So, yes, a 'natural' avoidance response might mean dashing out into traffic, accelerating dangerously in a car if 'being given chase' (unreal) and many other scenarios where the person would be putting themselves, (and quite  possibly bystanders) in danger.The unreal would be more real than reality This is one situation when obvously hopefully timely external professional intervention would come to the rescue.   The person who asked the question on your blog though may have meant something different??....whether perceived  hallucinatory attacks could cause physical damage directly (toxins,bites, stings eg perhaps) These thoughts would seem to come from  someone with some insight, puzzling, worrying and grappling to make sense of such  distorted perceptions. In that case they would feel very anxious and scared, and might suffer physically from  those natural feelings (fear, sleeplessness, fatigue, heart racing, sweating)   Hopefully they should seek out and gain comfort by networking and professional and family support, and optimal medication.   Just my take on this..   Sorry so long, Keep, up the good work! Chris UK