**Core Concept**
Hyperparathyroidism is a disorder where one or more of the parathyroid glands become overactive, leading to an excessive production of parathyroid hormone (PTH). This hormone plays a crucial role in regulating calcium levels in the blood by promoting the release of calcium from bones, increasing its absorption in the gut, and reducing its excretion by the kidneys.

**Why the Correct Answer is Right**
The overproduction of PTH in hyperparathyroidism leads to an increase in serum calcium levels, which can cause a range of symptoms. These include **muscle weakness**, **fatigue**, **bone pain**, and **osteoporosis**. Additionally, the high calcium levels can cause **kidney stones**, **constipation**, and **anxiety**. PTH also has a stimulating effect on the kidneys, which can lead to an increase in urine production, causing **polyuria** and **polydipsia**.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately reflect the symptoms associated with hyperparathyroidism. While **renal failure** can be a complication of untreated hyperparathyroidism, it is not a primary symptom.

**Option B:** This option is incorrect because **weight loss** is not a typical symptom of hyperparathyroidism. In fact, patients with hyperparathyroidism may experience weight gain due to increased appetite caused by elevated calcium levels.

**Option C:** This option is incorrect because **hypotension** is not typically associated with hyperparathyroidism. Elevated calcium levels can actually cause **hypertension** due to the vasoconstrictive effects of calcium on blood vessels.

**Clinical Pearl / High-Yield Fact**
A key clinical feature of hyperparathyroidism is the presence of **peaucular calcifications**, which are small, white or yellowish deposits that can be seen on the skin, particularly on the neck, face, and hands.

**Correct Answer:** C. bone pain, muscle weakness, fatigue, osteoporosis, kidney stones, constipation, anxiety, polyuria, polydipsia.