Hyperparathyroidism: What Doctors Do When Your Calcium and PTH Are Both High

When routine blood tests show both calcium and parathyroid hormone (PTH) levels above normal, doctors suspect hyperparathyroidism. This condition arises when one or more of your parathyroid glands—tiny glands in your neck—produce too much PTH. Excess PTH causes calcium to rise in your blood, which can affect bones, kidneys and other organs. Here's what you can expect next.

Understanding Hyperparathyroidism

Parathyroid hormone helps regulate calcium and phosphorus in your body. When PTH is too high:

• Your bones release more calcium into the bloodstream
• Your kidneys reabsorb extra calcium
• Your intestines absorb more calcium from food

Over time, that extra calcium can damage:

• Bones (loss of density, fractures)
• Kidneys (stones, reduced function)
• Heart and blood vessels

Doctors classify hyperparathyroidism as:

1. Primary – One or more parathyroid glands develop an adenoma (benign growth), hyperplasia (gland enlargement) or, rarely, cancer.
2. Secondary – A response to low calcium (e.g., in chronic kidney disease), which drives PTH up to compensate.
3. Tertiary – Long-standing secondary hyperparathyroidism (often after a kidney transplant) where glands remain overactive.

This guide focuses on primary hyperparathyroidism, the most common form with both calcium and PTH high.

Why Calcium and PTH Are High Together

Normally, high blood calcium suppresses PTH release. In primary hyperparathyroidism that feedback loop breaks due to gland overactivity:

• Calcium: Rises above the normal range (usually >10.2 mg/dL)
• PTH: Remains elevated or inappropriately "normal" despite high calcium

Persistently high calcium can cause:

• Weak or brittle bones
• Kidney stones or impaired kidney function
• Digestive symptoms (constipation, nausea)
• Mental fog, fatigue, depression
• Heart rhythm changes

Early stages may be mild or asymptomatic, so your doctor will rely on labs and further testing.

Diagnostic Steps

When labs confirm elevated calcium and PTH, your physician will usually:

1. Repeat tests to rule out lab error.
2. Measure related labs:
   • 25-hydroxy vitamin D (to check for deficiency)
   • Phosphorus (often low in primary hyperparathyroidism)
   • Kidney function (creatinine, eGFR)
   • 24-hour urinary calcium (to assess calcium loss through kidneys)
3. Evaluate symptoms: Even if mild, fatigue, muscle weakness or mood changes can matter.
4. Assess risk factors: Age, personal or family history of kidney stones or osteoporosis.
5. Order imaging (if surgery is an option):
   • Neck ultrasound to look for enlarged parathyroid glands
   • Sestamibi scan (nuclear medicine) to pinpoint overactive gland(s)
6. Check bone health:
   • DEXA scan for bone mineral density (spine, hip, forearm)
7. Assess heart and kidneys:
   • EKG for any calcium-related rhythm changes
   • Kidney ultrasound if stones are suspected

These steps help confirm primary hyperparathyroidism, rule out secondary causes (like vitamin D deficiency or kidney disease) and guide treatment.

Treatment Options

Treatment depends on symptom severity, lab results and overall health. Options include:

1. Active Monitoring ("Watchful Waiting")

For mild cases with minimal symptoms, your doctor may recommend:

• Regular blood tests (calcium, PTH, kidney function) every 6–12 months
• Annual DEXA scan to monitor bone density
• Periodic kidney imaging if you've had stones

This approach is safe if you remain symptom-free and labs stay stable.

2. Surgery (Parathyroidectomy)

Surgical removal of the overactive gland(s) is the only cure for primary hyperparathyroidism. It's generally recommended when:

• Calcium >1 mg/dL above normal
• Bone density T-score ≤ –2.5 (osteoporosis)
• Kidney stones or reduced kidney function (eGFR <60 mL/min)
• Age <50
• Clear symptoms (bone pain, muscle weakness, significant fatigue)

Surgery has high success rates (>95%) when performed by an experienced surgeon. Risks include:

• Temporary or permanent low calcium after surgery
• Voice changes (rare)
• Infection or bleeding (uncommon)

3. Medications

If you're not a candidate for surgery, doctors may prescribe:

• Calcimimetics (e.g., cinacalcet): Lower PTH and calcium by tricking the parathyroid gland into sensing more calcium.
• Bisphosphonates (e.g., alendronate): Help maintain bone density.
• Hormone replacement (in postmenopausal women): Can help protect bones but may carry other risks.

These are not cures but can control symptoms and biochemical changes.

Lifestyle and Monitoring

Beyond specific treatments, self-care and lifestyle measures make a difference:

• Stay hydrated: Drinking water helps reduce kidney stone risk.
• Moderate calcium intake: Don't overdo supplements; follow dietary guidelines.
• Limit sodium: High salt intake can increase calcium excretion in urine.
• Exercise regularly: Weight-bearing activities support bone health.
• Avoid thiazide diuretics (unless prescribed): These can raise calcium levels further; discuss alternatives with your doctor.
• Quit smoking and limit alcohol: Both harm bone health over time.

Regular follow-up is key. Even if you feel fine, complications can develop silently.

When to Seek Help

If you have any of the following, contact your doctor right away:

• Severe bone or muscle pain
• Stones in your urine or pain while urinating
• Heart palpitations, dizziness or fainting
• Marked confusion or severe fatigue
• Sudden weight loss or persistent nausea/vomiting

Always speak to a doctor about any life-threatening or serious symptoms.

If you're experiencing symptoms and want to better understand your condition before your doctor visit, you can use Ubie's free AI-powered Hyperparathyroidism symptom checker to get personalized insights in just a few minutes.

Working with Your Healthcare Team

Managing hyperparathyroidism often involves a team:

• Primary care physician to coordinate care and monitor labs
• Endocrinologist for hormonal evaluation and medical management
• Surgeon experienced in parathyroid operations
• Nephrologist if kidney function is compromised
• Dietitian to plan bone-and kidney-friendly meals

Keep a clear record of your lab values, imaging studies and symptoms. Ask questions like:

• "What are my exact calcium and PTH levels?"
• "Am I a candidate for surgery?"
• "What lifestyle changes should I prioritize?"
• "How often should I have follow-up tests?"

Key Takeaways

• Primary hyperparathyroidism occurs when parathyroid glands overproduce PTH, raising blood calcium.
• Diagnosis involves repeat labs, vitamin D levels, urinary calcium tests, bone density scans and imaging.
• Mild cases may be monitored; surgery is the only cure for most symptomatic or high-risk patients.
• Medications can manage symptoms if surgery isn't an option.
• Hydration, diet, exercise and regular follow-up reduce complications.
• Contact your doctor immediately for severe symptoms or signs of kidney stones, bone issues or heart rhythm changes.

Remember—early detection and appropriate treatment of hyperparathyroidism protect your bones, kidneys and heart. If in doubt, always speak to a doctor about any serious or life-threatening concerns.