Final answer:
The manifestations of pheochromocytoma include tachycardia, sweating, and diarrhea, which are associated with the excess production of catecholamines by the tumor. This leads to symptoms of the sympathetic fight or flight response.
Step-by-step explanation:
The manifestations of pheochromocytoma, a tumor of the adrenal medulla that causes excessive production of catecholamines, include symptoms such as tachycardia (increased heart rate), sweating, and diarrhea. These symptoms are related to the sympathetic activation associated with the condition, which can also lead to hypertension and increased risk of heart attacks. These manifestations are part of the body's fight or flight response due to the overproduction of catecholamines. Hence, of the options provided, B (tachycardia), C (sweating), and D (diarrhea) are correct, while A (weight gain) and E (anorexia) are not typically associated with pheochromocytoma. Patients often experience a weight loss rather than weight gain, contrary to the effects of hypothyroidism.