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Patient ReportsFamilial Hypocalciuric Hypercalcemia: Symptoms, Causes, Diagnosis & Treatment
Written by Medicover Team and Medically Reviewed by Dr Prashant Manohar Gaikwad , Endocrinologists
Table of Contents
Familial hypocalciuric hypercalcemia (FHH) is a rare inherited condition that causes lifelong mildly elevated calcium levels in the blood due to changes in the body's calcium-sensing receptors. Most people have few or no symptoms, but some may experience fatigue, muscle weakness, joint pain, or abdominal discomfort. Early diagnosis helps distinguish FHH from other causes of hypercalcemia and guides appropriate treatment and long-term management.
What are the Types of Familial Hypocalciuric Hypercalcemia?
Familial Hypocalciuric Hypercalcemia (FHH) is a genetic disorder that affects how the body regulates calcium levels. There are different types or forms of FHH, each with its own specific characteristics.
These forms of FHH are distinguished by various genetic mutations that affect the calcium-sensing receptors in the body. Understanding the different types of FHH is important for accurate diagnosis and management of this condition.
- Type 1 Familial Hypocalciuric Hypercalcemia: Caused by mutations in the CASR gene, leading to reduced sensitivity of calciumsensing receptors in the kidneys, resulting in elevated blood calcium levels.
- Type 2 Familial Hypocalciuric Hypercalcemia: Linked to mutations in the GNA11 gene, affecting the signaling pathway of the calciumsensing receptors, causing mild hypercalcemia and low urinary calcium excretion.
- Type 3 Familial Hypocalciuric Hypercalcemia: Associated with mutations in the AP2S1 gene, disrupting the normal function of parathyroid cells and leading to elevated blood calcium levels with low urinary calcium excretion.
- Type 4 Familial Hypocalciuric Hypercalcemia: Caused by mutations in the GNA11 gene, similar to Type 2 but with varied clinical presentations and severity of hypercalcemia.
- Type 5 Familial Hypocalciuric Hypercalcemia: Recently identified subtype, characterized by mutations in the GNA11 gene, resulting in hypercalcemia and low urinary calcium levels.
What are the Symptoms of Familial Hypocalciuric Hypercalcemia?
Familial Hypocalciuric Hypercalcemia (FHH) is a genetic condition that affects how the body regulates calcium levels. People with FHH may experience certain symptoms related to high calcium levels, but these symptoms can vary in severity and may not always be present. It is essential for individuals with suspected FHH to consult a healthcare professional for proper diagnosis and management.
- Elevated blood calcium levels
- Frequent kidney stones
- Bone pain
- Fatigue
- Muscle weakness
What are the Causes of Familial Hypocalciuric Hypercalcemia?
Familial Hypocalciuric Hypercalcemia is primarily caused by genetic mutations that affect the body's ability to regulate calcium levels. These mutations lead to increased levels of calcium in the blood without the corresponding increase in urinary calcium excretion. This condition is usually inherited in an autosomal dominant pattern, meaning it can be passed down from one affected parent.
- Genetic mutations in the calciumsensing receptor (CASR) gene
- Inherited autosomal dominant pattern
- Impaired ability of the kidneys to excrete calcium
When to See a Doctor for Familial Hypocalciuric Hypercalcemia?
Persistent high blood calcium levels, a family history of hypercalcemia, or symptoms such as excessive thirst, constipation, or muscle weakness should be evaluated by an endocrinologist. Early diagnosis helps distinguish Familial Hypocalciuric Hypercalcemia from other calcium disorders and ensures appropriate management.
You should see a doctor if you have:
- Repeatedly elevated blood calcium levels.
- A family history of hypercalcemia.
- Persistent fatigue, muscle weakness, or constipation.
- Symptoms that interfere with daily activities.
Get medical help immediately if:
- Severe abdominal pain suggestive of pancreatitis.
- Confusion, severe dehydration, or altered mental status.
- Symptoms of a hypercalcemic crisis, such as extreme weakness or persistent vomiting.
These could be signs of a serious complication like Familial Hypocalciuric Hypercalcemia, which needs urgent care.
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How Is Familial Hypocalciuric Hypercalcemia Diagnosed?
Familial Hypocalciuric Hypercalcemia is typically diagnosed through a combination of medical history, physical examination, and laboratory tests. Doctors may ask about family history and symptoms related to calcium levels. Physical exams can help identify any signs of hypercalcemia.
Laboratory tests, such as blood and urine tests, are crucial in confirming the diagnosis by measuring calcium and other related levels. Specialized tests may also be conducted to rule out other causes of high calcium levels. A comprehensive assessment is essential in diagnosing Familial Hypocalciuric Hypercalcemia accurately.
- Genetic testing
- Blood tests for calcium levels
- Urine tests for calcium levels
- Bone density scans
What are the Treatment for Familial Hypocalciuric Hypercalcemia?
Familial Hypocalciuric Hypercalcemia (FHH) is a genetic condition that affects how the body regulates calcium levels. Treatment for FHH focuses on managing symptoms and preventing complications associated with high blood calcium levels.
Some general treatment options may include monitoring calcium levels, maintaining a healthy diet, staying hydrated, and avoiding excessive calcium supplements. In some cases, medications may be prescribed to help manage calcium levels. It is essential for individuals with FHH to work closely with healthcare providers to develop a personalized treatment plan.
- Monitoring: Regular monitoring of blood calcium levels is crucial to track the progression of Familial Hypocalciuric Hypercalcemia and adjust treatment as needed.
- Vitamin D Supplementation: In some cases, vitamin D supplements may be prescribed to help regulate calcium levels in the body and improve overall bone health.
- Avoiding High Calcium Foods: Patients with Familial Hypocalciuric Hypercalcemia may benefit from limiting their intake of high calcium foods to prevent further elevations in blood calcium levels.
- Medication: In certain situations, medications such as calcimimetics may be prescribed to help lower blood calcium levels and manage symptoms associated with the condition.
- Genetic Counseling: Genetic counseling can be beneficial for individuals with Familial Hypocalciuric Hypercalcemia to understand the genetic implications of the condition and make informed decisions regarding family planning and future health management.
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What are the Risk Factors of Familial Hypocalciuric Hypercalcemia?
Familial Hypocalciuric Hypercalcemia is a rare genetic condition that affects how the body regulates calcium levels. Certain factors can increase the likelihood of developing this condition.
Understanding these risk factors is crucial for early detection and management. Risk factors for Familial Hypocalciuric Hypercalcemia:
- Family history of the condition
- Inherited genetic mutations
- Certain ethnic backgrounds (e. g., Caucasian)
What is the Recovery Process for Familial Hypocalciuric Hypercalcemia?
Familial Hypocalciuric Hypercalcemia is a lifelong inherited condition that usually has an excellent prognosis. Most individuals remain healthy with regular monitoring and do not require specific treatment. Ongoing follow-up helps detect rare complications and supports long-term well-being.
- Attend regular follow-up appointments with an endocrinologist.
- Monitor blood calcium and kidney function as recommended.
- Maintain good hydration.
- Inform healthcare providers about the diagnosis before undergoing treatment for hypercalcemia.
- Seek genetic counseling for family members when appropriate.
- Report new or worsening symptoms promptly.
Frequently Asked Questions
1. What is Familial Hypocalciuric Hypercalcemia (FHH)?
FHH is a rare genetic disorder that leads to high levels of calcium in the blood and low levels of calcium in the urine.
2. What are the symptoms of Familial Hypocalciuric Hypercalcemia?
Most individuals with FHH do not exhibit any symptoms, but some may experience fatigue, weakness, frequent urination, and kidney stones.
3. How is Familial Hypocalciuric Hypercalcemia diagnosed?
Diagnosis typically involves blood tests to measure calcium levels, parathyroid hormone levels, and genetic testing to identify mutations in the calcium-sensing receptor gene.
4. What are the treatment options for Familial Hypocalciuric Hypercalcemia?
Treatment usually involves monitoring calcium levels regularly and managing symptoms if present. Surgery may be considered in severe cases with complications.
5. Is Familial Hypocalciuric Hypercalcemia a hereditary condition?
Yes, FHH is an inherited disorder that follows an autosomal dominant pattern, meaning a child has a 50% chance of inheriting the mutation from an affected parent.
