Final answer:
Edna's symptoms of weight gain, cold intolerance, and low blood pressure suggest she has hypothyroidism, where the thyroid gland is underactive.
Step-by-step explanation:
Edna complains of weight gain, cold intolerance, and low blood pressure. These symptoms are consistent with hypothyroidism, which is a condition where the thyroid gland is underactive. People with hypothyroidism often experience a low metabolic rate along with symptoms such as feeling cold, experiencing weight gain, and having low blood pressure. In contrast, hyperthyroidism would typically present with symptoms such as weight loss, increased sweating, and an increased heart rate. Graves' disease, a form of hyperthyroidism, is often characterized by symptoms like heat intolerance and bulging eyes, or exophthalmos. As for goiter, it is commonly associated with hypothyroidism and can result from dietary iodine deficiency, causing symptoms similar to hypothyroidism due to insufficient thyroid hormone production.