 [ Symptoms ] can low blood pressure cause hallucinations [ Disease ] low blood pressure can result in reduced blood flow and circulation into the brain with poor brain function the usual symptom of dangerously low blood pressure hypotension is a depressed level of consciousness—someone acting sleepy or “out of it ” hallucinations are not a “typical” symptom of low blood pressure however i would not rule it out as a possibility in rare cases it would be important to look for something else causing both the low blood pressure and the hallucinations like a toxic drug effect or dehydration causing delirium in an older person