Parathyroid, calcium & metabolic bone care

Parathyroid disorders
& calcium imbalance

The parathyroid glands are four small glands usually located behind the thyroid gland in the neck. Although their names sound similar, the thyroid and parathyroid glands perform completely different functions. The parathyroid glands produce parathyroid hormone (PTH), which plays an essential role in maintaining normal calcium and phosphate levels in the body. Calcium is important not only for strong bones and teeth but also for normal muscle movement, nerve function and heartbeat. When the parathyroid glands produce too much or too little hormone, calcium and phosphate balance can become disturbed, sometimes leading to kidney stones, bone weakness, muscle cramps, tingling sensations and other health problems. Some patients have no noticeable symptoms, and the condition is discovered unexpectedly during routine blood testing.

Parathyroid disorders can occur when the glands become overactive or underactive. Hyperparathyroidism occurs when parathyroid hormone levels are inappropriately high. In primary hyperparathyroidism, one or more parathyroid glands produce excess hormone, often because of a benign enlargement called a parathyroid adenoma. This commonly causes increased blood calcium levels and may lead to kidney stones, osteoporosis, fractures or kidney-related complications. In secondary hyperparathyroidism, PTH rises in response to another problem, such as vitamin D deficiency, inadequate calcium intake or chronic kidney disease. Longstanding severe secondary hyperparathyroidism, particularly in advanced kidney disease, can sometimes progress to tertiary hyperparathyroidism, in which the glands continue producing excessive PTH despite correction of the original stimulus. These conditions have different causes and require different approaches to treatment.

Not every elevated PTH level means that a person has a parathyroid tumour or needs surgery. This is an important distinction because high PTH may be the body’s normal response to low calcium, vitamin D deficiency or reduced kidney function. Some patients with primary hyperparathyroidism have high calcium with elevated or inappropriately normal PTH, while others may have persistently normal calcium with elevated PTH after secondary causes have been carefully excluded. A rare inherited condition called familial hypocalciuric hypercalcemia can also cause lifelong mild elevation of blood calcium and may resemble primary hyperparathyroidism. Identifying the correct condition is important because surgery usually does not correct the calcium abnormality in familial hypocalciuric hypercalcemia. Interpreting PTH together with calcium, phosphate, vitamin D and kidney function helps avoid unnecessary investigations and inappropriate treatment.

Low parathyroid hormone levels can also cause significant health problems. Hypoparathyroidism occurs when the parathyroid glands do not produce enough hormone, leading to low blood calcium and often increased phosphate levels. One of the most common causes in adults is damage to or removal of the parathyroid glands during thyroid or neck surgery. It may also result from autoimmune conditions, inherited disorders or other less common causes. Patients may experience tingling around the mouth, numbness in the fingers, painful muscle cramps, spasms or, in severe cases, seizures and abnormal heart rhythms. Some people develop temporary low calcium after thyroid surgery, while others require long-term treatment. Chronic hypoparathyroidism often needs carefully adjusted calcium and active vitamin D treatment, and selected patients may benefit from PTH replacement therapy under specialist supervision.

Parathyroid disorders can affect the bones, kidneys and other organs even before obvious symptoms appear. Excess PTH in primary hyperparathyroidism can accelerate bone loss and increase the risk of osteoporosis and fractures. High blood calcium may contribute to kidney stones, increased urination, dehydration and reduced kidney function. In contrast, inadequate PTH can cause persistent low calcium, requiring careful treatment to prevent symptoms while avoiding excessive calcium loss through the urine. Patients with advanced kidney disease may develop secondary hyperparathyroidism as part of chronic kidney disease-mineral and bone disorder (CKD-MBD), involving abnormalities of calcium, phosphate, PTH and bone metabolism. Appropriate assessment is therefore important not only for correcting laboratory values but also for protecting long-term bone and kidney health.

A detailed evaluation helps determine whether the problem requires observation, medicines or surgery. Investigations may include serum calcium, albumin or ionised calcium, phosphate, intact PTH, vitamin D, magnesium, kidney function and urine calcium measurements. Selected patients may require bone mineral density testing (DXA), kidney imaging or genetic evaluation. In primary hyperparathyroidism, parathyroid surgery can provide a definitive cure in appropriate patients, particularly those with kidney stones, osteoporosis, significant calcium elevation or other recognised surgical indications. Importantly, neck ultrasound and parathyroid scans are generally used to locate abnormal glands before planned surgery, not to establish the initial diagnosis. Patients who do not undergo surgery may require medical treatment and regular monitoring. In hypoparathyroidism, the goal is to maintain safe calcium levels while minimising kidney-related complications.

Dr. Rajesh Moganti (MD, DM Endocrinology) provides comprehensive evaluation and management of parathyroid disorders, high and low calcium levels, primary hyperparathyroidism, hypoparathyroidism, parathyroid-related bone disease and hormonal calcium disturbances at our Rajahmundry and Tanuku centres. Care focuses on identifying the underlying cause, avoiding unnecessary investigations, selecting appropriate medical treatment and determining when specialised parathyroid surgery or coordinated kidney care is required. Regular follow-up is provided for patients requiring long-term monitoring of calcium, PTH, bone strength and kidney health.