Which of the following are symptoms associated with hyperthyroidism?

Hyperthyroidism is a condition characterized by the overproduction of thyroid hormones, leading to a range of symptoms that reflect an accelerated metabolism. The symptoms associated with hyperthyroidism include weight loss, which occurs due to increased metabolic rate and energy expenditure. A rapid heartbeat, or tachycardia, is another common symptom as elevated thyroid hormone levels stimulate the heart to pump faster. Moodiness and irritability can also be attributed to the hormonal imbalance affecting mood regulation and emotional stability.

In contrast, the other options present symptoms that are typically associated with other conditions. For instance, weight gain and fatigue are more commonly linked to hypothyroidism, while increased sleep and heavy menstrual cycles are not characteristic of hyperthyroidism—these symptoms may suggest an entirely different hormonal imbalance. Dry skin and cold intolerance also align with hypothyroidism, as lowered metabolic activity can lead to decreased energy production and alters the body's ability to regulate temperature.