When Calcium Levels Are Too High

Calcium is crucial for maintaining strong bones and teeth, but did you know that too much of it can actually be harmful? In this article, we explore the potential dangers of high calcium levels in the body. We will delve into the various symptoms and complications that can arise when calcium levels exceed the recommended range. Additionally, we’ll provide insights into the associated health risks and offer practical tips to help you maintain optimal calcium levels for a healthy and balanced life. So, if you’ve ever wondered about the potential drawbacks of too much calcium, this article is here to provide you with all the essential information you need.

When Calcium Levels Are Too High

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Causes of High Calcium Levels


One of the main causes of high calcium levels is hyperparathyroidism. This condition occurs when the parathyroid glands produce too much parathyroid hormone (PTH), which regulates calcium levels in the body. When there is an excess of PTH, it leads to increased calcium absorption from the bones and intestines, resulting in high calcium levels in the blood.


Certain types of cancer can also cause high calcium levels, a condition known as hypercalcemia of malignancy. Cancer cells can release substances that increase the breakdown of bones, releasing excess calcium into the bloodstream. Additionally, some tumors can directly produce PTH-like hormones, causing calcium levels to rise.


Thyrotoxicosis, a condition characterized by an overactive thyroid gland, can lead to high calcium levels. This is because excessive levels of thyroid hormones can increase the production and release of PTH, leading to elevated calcium levels in the blood.

Excessive Vitamin D Intake

While vitamin D is essential for calcium absorption, excessive intake of vitamin D supplements or medications can cause hypercalcemia. Vitamin D helps the intestines absorb calcium, and when taken in excess, it can lead to increased calcium levels in the blood.

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Granulomatous Diseases

Granulomatous diseases, such as sarcoidosis or tuberculosis, can cause high calcium levels. In these conditions, immune cells form clumps called granulomas, which can increase the production of vitamin D and, subsequently, calcium absorption from the intestines.

Symptoms of High Calcium Levels


Feeling excessively tired and lacking energy is a common symptom of high calcium levels. The increased calcium in the blood can affect muscle function and lead to fatigue and weakness.

Excessive Thirst and Urination

High calcium levels can cause increased thirst and frequent urination. This occurs because the kidneys work to remove the excess calcium from the blood, resulting in increased urine production.


Another symptom of high calcium levels is constipation. Calcium can slow down the movement of the digestive system, leading to difficulty in passing stools.

Nausea and Vomiting

When calcium levels are too high, it can cause nausea and vomiting. These symptoms can be an indication that the body is trying to eliminate the excess calcium through the digestive system.

Abdominal Pain

Individuals with high calcium levels may experience abdominal pain. This can be a result of the digestive system becoming imbalanced due to excessive calcium absorption.

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Complications of High Calcium Levels

Kidney Stones

High levels of calcium in the blood can lead to the formation of kidney stones. When calcium levels are elevated, the excess calcium can be deposited in the kidneys and precipitate into stones, which can cause severe pain and blockage of the urinary tract.


Although calcium is essential for bone health, excessive calcium levels can have a negative impact. When calcium levels are too high for an extended period, it can lead to bone loss and weaken the bones, increasing the risk of osteoporosis.

Cardiovascular Issues

An imbalance in calcium levels can affect the cardiovascular system. High calcium levels can lead to the calcification of blood vessels, increasing the risk of cardiovascular diseases such as heart attacks and strokes.

Muscle Weakness

Elevated calcium levels can impair muscle function and cause muscle weakness. This can result in difficulties with movement and daily activities.

Diagnosing High Calcium Levels

Blood tests

To diagnose high calcium levels, healthcare professionals commonly perform blood tests to measure the levels of calcium in the blood. If the calcium levels are consistently above the normal range, it may indicate hypercalcemia.

Urine tests

In addition to blood tests, healthcare professionals may also conduct urine tests to assess calcium levels. These tests can help determine the cause of high calcium levels and rule out conditions such as hyperparathyroidism or kidney dysfunction.

Imaging tests

Imaging tests, such as X-rays or bone density scans, may be ordered to investigate any potential complications associated with high calcium levels. These tests can help assess bone health and detect any abnormalities.

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When Calcium Levels Are Too High

Treatment Options for High Calcium Levels

Fluids and Medications

In cases of mild or moderate hypercalcemia, increasing fluid intake can help flush out excess calcium through the urine. Medications such as bisphosphonates or calcitonin may also be prescribed to reduce calcium levels in the blood.

Underlying Condition Treatment

Treating the underlying cause of high calcium levels is essential for long-term management. Depending on the specific condition causing hypercalcemia, treatment can involve surgery, radiation therapy, or medications targeting the primary disease.


If hyperparathyroidism or another condition affecting the parathyroid glands is causing high calcium levels, surgery may be necessary to remove the affected gland.

Lifestyle Changes

Adopting a healthy lifestyle can be beneficial in managing high calcium levels. This includes exercising regularly, maintaining a balanced diet, and avoiding excessive intake of calcium or vitamin D supplements.

Preventing High Calcium Levels

Maintain a Balanced Diet

Eating a well-balanced diet is crucial for preventing high calcium levels. Including sources of calcium in moderation, along with other essential nutrients, can help maintain calcium levels within the normal range.

Moderate Calcium Intake

While calcium is vital for overall health, excessive intake can lead to complications. It is important to adhere to the recommended daily calcium intake for each age group and avoid excessive calcium supplementation.

Regular Physical Activity

Engaging in regular physical activity can support a healthy calcium balance in the body. Weight-bearing exercises, such as walking or weightlifting, can help maintain bone density and reduce the risk of developing complications from high calcium levels.

Regular Check-ups

Routine check-ups with healthcare professionals can help detect any changes in calcium levels and address any underlying conditions promptly. Regular monitoring is particularly important for individuals at higher risk of developing hypercalcemia.

When Calcium Levels Are Too High

The Role of Calcium in Health

Strong Bones and Teeth

Calcium is essential for the development and maintenance of strong bones and teeth. It provides the structural support necessary for skeletal health and helps prevent conditions such as osteoporosis.

Muscle Function

Calcium plays a vital role in muscle contraction and relaxation. It enables muscles to contract properly and is critical for activities ranging from simple movements to complex actions.

Nerve Transmission

Calcium ions are involved in the transmission of nerve impulses throughout the body. Proper calcium levels are essential for the communication between nerve cells and the functioning of the nervous system.

Regulating Hormones

Calcium is involved in the regulation of various hormones in the body. Adequate calcium levels are necessary for the proper functioning of the endocrine system, which controls hormone production and release.

Blood Clotting

Calcium is a key component in the process of blood clotting. When a blood vessel is injured, calcium aids in the formation of blood clots, which help prevent excessive bleeding.

Recommended Daily Calcium Intake

Age 1-3 years

300 mg of calcium per day is recommended for toddlers aged 1-3 years.

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Age 4-8 years

800 mg of calcium per day is recommended for children aged 4-8 years.

Age 9-18 years

1300 mg of calcium per day is recommended for adolescents aged 9-18 years.

Age 19-50 years

1000 mg of calcium per day is recommended for adults aged 19-50 years.

Age 51-70 years

1000 mg of calcium per day is recommended for adults aged 51-70 years.

Age 71+ years

1200 mg of calcium per day is recommended for adults aged 71+ years.

Pregnant and breastfeeding women

Pregnant and breastfeeding women have increased calcium needs. A daily intake of 1000-1300 mg is generally recommended during this period.

Natural Sources of Calcium

Dairy Products

Dairy products such as milk, cheese, and yogurt are excellent sources of calcium. They provide a readily absorbable form of calcium along with other essential nutrients like vitamin D.

Leafy Green Vegetables

Leafy green vegetables, such as kale, broccoli, and bok choy, are rich in calcium. These vegetables are also high in other nutrients and are a great addition to any balanced diet.

Soy Products

Many soy products, including tofu and soy milk, are fortified with calcium, providing an alternative for individuals who have dietary restrictions or choose not to consume dairy.

Nuts and Seeds

Almonds, sesame seeds, and chia seeds are examples of nuts and seeds that contain calcium. Incorporating them into meals or snacks can contribute to overall calcium intake.

Fish with Bones

Certain fish, such as canned salmon or sardines, contain edible bones that are a good source of calcium. Including these in the diet can provide calcium along with omega-3 fatty acids.

Factors Affecting Calcium Absorption

Vitamin D Levels

Adequate vitamin D levels are crucial for proper calcium absorption. Vitamin D facilitates calcium absorption from the intestines, ensuring its availability for various bodily functions.

Phytic Acid and Oxalates

Phytic acid and oxalates, naturally occurring compounds in some plant foods, can bind to calcium and inhibit its absorption. However, a well-balanced diet containing a variety of calcium-rich foods can help compensate for this.


As individuals age, the ability to absorb calcium may decrease. Therefore, older adults may require higher calcium intake or supplementation to meet their calcium needs.


Women’s calcium needs increase during adolescence, pregnancy, and breastfeeding due to the additional demands placed on their bodies. It is important for women to be mindful of their calcium intake during these stages.


Certain medications, such as corticosteroids or diuretics, can affect calcium absorption. It is important to discuss medication use with healthcare professionals and monitor calcium levels as necessary.

In conclusion, while calcium is essential for optimal health, high calcium levels can lead to various complications. Hyperparathyroidism, cancer, thyrotoxicosis, excessive vitamin D intake, and granulomatous diseases are among the causes of high calcium levels. Symptoms can include fatigue, excessive thirst and urination, constipation, nausea and vomiting, and abdominal pain. Complications of high calcium levels may include kidney stones, osteoporosis, cardiovascular issues, and muscle weakness. Diagnosis often involves blood and urine tests, as well as imaging tests. Treatment options include fluids and medications, addressing the underlying condition, surgery, and lifestyle changes. Prevention involves maintaining a balanced diet, moderate calcium intake, regular physical activity, and regular check-ups. Calcium plays a crucial role in bone and teeth health, muscle function, nerve transmission, hormone regulation, and blood clotting. Recommended daily calcium intake varies with age and gender. Natural sources of calcium include dairy products, leafy green vegetables, soy products, nuts and seeds, and fish with bones. Factors affecting calcium absorption include vitamin D levels, phytic acid and oxalates, age, gender, and medications. By understanding the causes, symptoms, complications, diagnosis, treatment, prevention, and role of calcium in health, individuals can make informed choices to maintain optimal calcium levels and overall well-being.

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