Early symptoms of hypothyroidism include which of the following?

Fatigue is a hallmark early symptom of hypothyroidism, primarily resulting from a decrease in metabolic rate and energy production due to insufficient levels of thyroid hormones. This physiological change can lead to a general sense of tiredness and lack of energy, making it difficult for individuals to engage in regular daily activities.

In hypothyroidism, the body's processes slow down, which contrasts sharply with symptoms experienced in hyperthyroidism, where increased appetite, weight loss, and rapid heartbeat are more common due to heightened metabolic activity. Thus, fatigue serves as an important indicator for early detection and management of hypothyroidism, allowing for timely intervention and treatment to restore proper thyroid function.