What is a common symptom of hypothyroidism?

Fatigue is a common symptom of hypothyroidism due to the decrease in metabolic processes caused by insufficient thyroid hormone levels. The thyroid hormones, primarily thyroxine (T4) and triiodothyronine (T3), play a crucial role in regulating metabolism and energy production in the body. When these hormone levels are low, it can lead to a general feeling of tiredness or sluggishness, often described as fatigue. This symptom can affect various aspects of daily life, including physical activity and cognitive function, leading to a significant impact on a patient's quality of life.

The other symptoms such as excessive sweating, tachycardia, and weight loss, are typically associated with hyperthyroidism, where an overproduction of thyroid hormones results in increased metabolic activity. Understanding these distinctions is key in diagnosing thyroid-related disorders effectively.