It can be difficult to diagnose a psychiatric disorder becauseGroup of answer choicespatients suffering from the same disorder often display different symptoms.first one must decide if the behavior is pathological, or if it is just an extreme variation of normal human behavior, patients suffering from the same disorder often display different symptoms, and patients suffering from different disorders often display some of the same symptoms.first one must decide if the behavior is pathological, or if it is just an extreme variation of normal human behavior.patients suffering from different disorders often display some of the same symptoms.