All are seen in hypothyroidism except ?
**Core Concept**
Hypothyroidism is a condition characterized by reduced production of thyroid hormones, leading to various systemic effects on the body. It affects multiple organ systems, including the cardiovascular, musculoskeletal, and nervous systems.
**Why the Correct Answer is Right**
Hypothyroidism is often associated with an increase in cholesterol levels, leading to hyperlipidemia. Additionally, patients may experience dry skin, hair loss, and muscle weakness. The most common cause of hypothyroidism is autoimmune thyroiditis, also known as Hashimoto's thyroiditis. This condition leads to the destruction of thyroid tissue and subsequent reduction in thyroid hormone production.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is actually seen in hyperthyroidism, not hypothyroidism. Hyperthyroidism is characterized by an overproduction of thyroid hormones.
**Option B:** This option is incorrect because it is indeed seen in hypothyroidism. Hypothyroidism can cause a decrease in metabolic rate, leading to weight gain and obesity.
**Option C:** This option is incorrect because it is actually seen in hyperthyroidism, not hypothyroidism. Hyperthyroidism can cause an increase in heart rate and cardiac output.
**Clinical Pearl / High-Yield Fact**
A classic exam trap is to confuse hypothyroidism with hyperthyroidism. Remember that hypothyroidism is characterized by a decrease in thyroid hormone production, leading to decreased metabolic rate, weight gain, and dry skin.
**Correct Answer: A. This option is incorrect because it is actually seen in hyperthyroidism, not hypothyroidism.**