Which symptom is associated with pheochromocytoma?

Pheochromocytoma is a tumor that usually develops in the adrenal glands and results in the excessive production of catecholamines, such as epinephrine and norepinephrine. These hormones are involved in the body's "fight or flight" response, leading to various physiological changes when released in high amounts.

High blood pressure is a prominent symptom of pheochromocytoma due to the excess catecholamines causing vasoconstriction and increased heart rate. This can lead to paroxysmal hypertension, where blood pressure rises suddenly and severely. Patients may experience episodes of hypertension that can be accompanied by symptoms such as headaches, palpitations, and sweating.

Other options, while they may reflect different health issues, are not characteristic of pheochromocytoma. Weight gain is typically associated with conditions like hypothyroidism or Cushing's syndrome. Severe abdominal pain can arise from various gastrointestinal issues but is not a primary symptom of pheochromocytoma. Excessive thirst is often linked to diabetes or conditions that disturb fluid balance, rather than the hyperadrenergic state caused by pheochromocytoma.

Thus, high blood pressure is indeed the symptom most directly associated with the pathology of pheochromocytoma.