Which of the following describes the diagnostic sign of myxedema?

Myxedema is a medical condition associated with severe hypothyroidism, where the body does not produce enough thyroid hormones. One of the characteristic signs of myxedema is dry skin and hair. This occurs because thyroid hormones play a crucial role in maintaining the skin's moisture levels and overall health. In cases of hypothyroidism, where there is a deficiency of these hormones, the skin and hair can lose their usual hydration, leading to the observation of dryness.

The other options do not relate to the symptoms of myxedema. Increased sweating is typically associated with hyperthyroidism rather than hypothyroidism, whereas rapid weight loss is also more indicative of hyperthyroidism. Severe headaches are not a defining symptom of myxedema and can be related to a myriad of other medical conditions but are not specific to this condition. Therefore, the presence of dry skin and hair is a hallmark sign of myxedema, reflecting the underlying endocrine imbalance.