Why is Parathyroid Hormone (PTH) high? Causes, symptoms, and what to do

Parathyroid Hormone (PTH) is a crucial hormone that helps regulate calcium levels in your blood. When PTH levels are higher than normal, it can indicate an underlying health issue that may need attention. Understanding the causes and symptoms of high PTH levels can help you make informed decisions about your health.

What is Parathyroid Hormone (PTH)?

Parathyroid Hormone (PTH) is produced by the parathyroid glands, which are small glands located in your neck. PTH plays a vital role in maintaining the balance of calcium, phosphorus, and vitamin D in your blood and bones. The typical adult range for PTH is 15–65 pg/mL (intact PTH assay). When levels fall outside this range, it can affect bone health, kidney function, and overall metabolism.

Causes of High PTH Levels

There are several reasons why PTH levels might be elevated:

• Primary Hyperparathyroidism: This is a condition where one or more of the parathyroid glands become overactive and secrete too much hormone, often due to a benign tumor.
• Secondary Hyperparathyroidism: This occurs when another condition, such as kidney disease or vitamin D deficiency, causes low calcium levels, prompting the parathyroid glands to produce more PTH.
• Tertiary Hyperparathyroidism: This is a more advanced form of secondary hyperparathyroidism, usually occurring in patients with long-term kidney disease.
• Low Vitamin D Levels: Insufficient vitamin D can lead to increased PTH production as the body attempts to balance calcium levels.

Symptoms of High PTH Levels

High PTH levels can lead to a variety of symptoms, including:

• Bone Pain and Fragility: Excess PTH can cause bones to release calcium into the bloodstream, leading to weaker bones and increased fracture risk.
• Kidney Stones: Elevated calcium levels can lead to the formation of kidney stones.
• Fatigue and Weakness: High PTH levels can cause general fatigue and muscle weakness.
• Digestive Issues: Some people may experience nausea, vomiting, or loss of appetite.

How to Interpret PTH Test Results

A PTH blood test measures the level of parathyroid hormone in your blood. If your results show a level higher than the typical range of 15–65 pg/mL (intact PTH assay), it is important to discuss these results with your healthcare provider. They may suggest further testing or treatment based on your overall health and symptoms.

Frequently asked questions

What is considered a high PTH level?

A PTH level above 65 pg/mL (intact PTH assay) is typically considered high. However, your healthcare provider will interpret your results in the context of your overall health and other test results.

Can high PTH levels be treated?

Yes, treatment depends on the underlying cause. Options may include medication, dietary changes, or surgery if a tumor is present.

What lifestyle changes can help manage high PTH levels?

Ensuring adequate intake of calcium and vitamin D, staying hydrated, and maintaining a balanced diet can support your health. Always discuss lifestyle changes with your healthcare provider.

When to see a doctor

If you have symptoms such as persistent bone pain, frequent kidney stones, or unexplained fatigue, it is important to consult with a healthcare provider. They can determine if a PTH test is necessary and help you understand your results.

Remember, this information is for educational purposes and any medical decisions should be made in consultation with your healthcare provider.