You are treating an 82 year old female patient for arthritic…

You are treating an 82 year old female patient for arthritic pain in her feet that is affecting her mobility. Today your patient presents to PT with a new onset of confusion and disorientation. The patient says that she may have fallen yesterday, but can’t remember. She reports a mild and worsening headache that started yesterday. You immediately call 911 because you suspect this patient’s symptoms could MOST likely be caused by: