PATIENT EDUCATION
Calcium, Vitamin D & Parathyroid Disorders
Calcium balance is controlled by the parathyroid glands, vitamin D, kidneys, bones and digestive system. Abnormal blood calcium can be mild and silent or, when severe, can cause important neurological, cardiac or kidney symptoms.
Select a topic below to view more information.
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Low Vitamin D or Bone/Muscle Aches
What you'll notice or feel
- A blood test reports low vitamin D.
- Diffuse muscle aches or weakness.
- Bone discomfort in more severe deficiency.
- Sometimes no symptoms at all.
Common causes
- Limited sunlight exposure, low dietary intake or reduced absorption.
- Obesity can be associated with lower measured vitamin D.
- Kidney, liver or malabsorption disorders can contribute.
What it could be
- Vitamin D deficiency or insufficiency requiring context-specific treatment.
- Another cause of pain if symptoms persist after correction.
Initial self-care
- Use vitamin D only in the dose advised for your result and health status.
- Avoid repeated very high-dose injections or sachets without monitoring.
- Maintain dietary calcium unless your clinician has advised restriction.
When to see a doctor urgently
- Severe weakness, confusion, vomiting or abnormal heart symptoms require assessment because they may reflect calcium disturbance rather than vitamin D alone.
When to see a doctor
- Vitamin D remains low despite treatment.
- There are recurrent kidney stones or abnormal calcium levels.
- You have osteoporosis, malabsorption or kidney disease.
High Calcium on a Blood Test
What you'll notice or feel
- High calcium found incidentally.
- Thirst, frequent urination or constipation.
- Fatigue, low mood or poor concentration.
- Kidney stones or bone loss may occur over time.
Common causes
- Primary hyperparathyroidism is a common endocrine cause.
- Dehydration or some medicines can contribute.
- Other medical conditions can raise calcium.
What it could be
- Primary hyperparathyroidism.
- Medication-related or non-parathyroid hypercalcaemia.
Initial self-care
- Do not take extra calcium or high-dose vitamin D until reviewed.
- Maintain hydration unless medically restricted.
- Bring all medicines and supplements to the appointment.
When to see a doctor urgently
- Marked confusion, severe vomiting, dehydration, severe weakness or abnormal heartbeat.
When to see a doctor
- Calcium is repeatedly high.
- There are kidney stones, osteoporosis or reduced kidney function.
- PTH has been reported as abnormal.
Low Calcium, Tingling or Muscle Spasms
What you'll notice or feel
- Tingling around the mouth or fingertips.
- Muscle cramps or spasms.
- In severe cases, marked stiffness or seizures.
- A low calcium result on blood testing.
Common causes
- Vitamin D deficiency.
- Low parathyroid hormone after neck surgery or from other causes.
- Kidney disease or low magnesium.
- Some medicines.
What it could be
- Hypocalcaemia requiring confirmation and identification of the cause.
Initial self-care
- Do not self-treat severe symptoms with large calcium doses without assessment.
- Bring recent calcium, albumin, magnesium and vitamin D results if available.
- Take prescribed calcium/vitamin D consistently.
When to see a doctor urgently
- Severe muscle spasms, seizures, breathing difficulty or significant palpitations.
When to see a doctor
- Tingling or cramps recur.
- Calcium remains low despite supplements.
- Symptoms began after thyroid/parathyroid surgery.
Kidney Stones With Calcium or Parathyroid Concerns
What you'll notice or feel
- Recurrent kidney stones.
- High calcium or high PTH on blood tests.
- Flank pain or blood in the urine during stone episodes.
- Low bone density may coexist.
Common causes
- Primary hyperparathyroidism can increase calcium in blood and urine.
- Other metabolic or dietary factors also contribute to stones.
What it could be
- A parathyroid disorder contributing to stone risk.
- A separate kidney-stone disorder with normal parathyroid function.
Initial self-care
- Maintain hydration unless medically restricted.
- Do not severely restrict dietary calcium without advice.
- Keep stone-analysis and urine-test results if available.
When to see a doctor urgently
- Severe flank pain with fever, vomiting or inability to pass urine.
When to see a doctor
- Stones are recurrent.
- High calcium accompanies kidney stones.
- There is also osteoporosis or reduced kidney function.
Abnormal Parathyroid Hormone (PTH)
What you'll notice or feel
- PTH reported high or low on a blood test.
- You may have no symptoms.
- Calcium may be high, low or normal depending on the cause.
Common causes
- Primary hyperparathyroidism when calcium is high.
- Secondary hyperparathyroidism from vitamin D deficiency or kidney disease.
- Low PTH after neck surgery or autoimmune causes.
What it could be
- A parathyroid disorder requiring interpretation together with calcium, vitamin D and kidney function.
Initial self-care
- Do not interpret PTH in isolation.
- Bring calcium, albumin, phosphate, creatinine and vitamin D results.
- Avoid changing supplements until the pattern is reviewed.
When to see a doctor urgently
- Severe symptoms from high or low calcium need urgent care.
When to see a doctor
- PTH is repeatedly abnormal.
- There are stones, fractures or osteoporosis.
- Calcium is abnormal or kidney function is impaired.
YOUR CONSULTATION
What to Expect at Your Visit
- Review of symptoms, kidney stones, fractures, diet, supplements and neck-surgery history.
- Blood testing may include calcium, albumin, phosphate, creatinine, magnesium, PTH and vitamin D.
- Urine calcium is useful in selected patients.
- Bone-density and kidney imaging may be considered when primary hyperparathyroidism is suspected.
- Treatment depends on the underlying cause rather than the calcium number alone.
- Surgical referral may be appropriate for selected patients with primary hyperparathyroidism.
* IMPORTANT: A Note Before You Go
Vitamin D, calcium and PTH results should be interpreted together. Taking high-dose supplements without checking the underlying cause can sometimes make calcium disorders worse.
This page provides general educational information and cannot replace an individual medical assessment. If symptoms are persistent, worsening or concerning, arrange appropriate medical review.
NEED AN ASSESSMENT?
Arrange an Endocrinology Consultation
For non-emergency assessment or follow-up, appointments are booked through the hospital’s central appointment desk on 0422 432 4433. For severe or rapidly worsening symptoms, seek urgent medical care rather than waiting for a routine appointment.