Which consequence is most commonly associated with untreated hypothyroidism?

Untreated hypothyroidism is primarily associated with weight gain due to the body's slowed metabolism. The thyroid hormones play a crucial role in regulating metabolic processes, including the conversion of food into energy. When hypothyroidism occurs, the production of these hormones decreases, leading to a downturn in metabolic function. As a result, individuals often experience an accumulation of body weight because their bodies are not effectively burning calories.

In addition, untreated hypothyroidism can lead to an increase in cholesterol levels, which can further contribute to weight gain. The deficiency in thyroid hormone also results in various other symptoms, but the most noteworthy consequence is typically the increase in weight due to metabolic changes.

While the other symptoms and conditions mentioned, like rapid heartbeat, increased sweating, and hypoglycemia, can occur in endocrine disorders, they are more commonly associated with conditions of hyperthyroidism rather than hypothyroidism. Thus, weight gain remains the most prevalent and recognized consequence specifically tied to untreated hypothyroidism.