Increased adrenaline secretion is observed in pheochromocytoma, hypoglycemia, myocardial infarction and to a lesser degree in essential tremor (also known as benign, familial or idiopathic tremor).Increased adrenaline secretion is observed in pheochromocytoma, hypoglycemia, myocardial infarction and to a lesser degree in essential tremor (also known as benign, familial or idiopathic tremor).