How come most doctors not want to concider juvenile bipolar disorder?

New diagnosis: Bipolar is a new diagnosis....And most kids do not really have such ups and downs. Some bipolar is due to a nutritional deficiency. Children may have an actual physical cause for symptom. Pediatricians / child psychiatrists will hopefully look for a physical or organic cause for mood swings before resorting to such a diagnosis and the meds usually used for it.