Hypernatremia
What is Hypernatremia?
Hypernatremia is a condition where your blood contains too much sodium. Sodium is a mineral that helps control the balance of water in and around your cells. When sodium levels rise too high, your cells can lose water and shrink. This can affect how your brain, muscles, and organs work.
Your kidneys normally regulate sodium by filtering extra amounts into your urine. Hypernatremia usually happens when you lose more water than sodium, making your blood more concentrated. This is why dehydration is the most common cause. The condition can also develop if you take in too much sodium or if certain diseases affect how your body handles water.
Normal sodium levels range from 135 to 145 milliequivalents per liter. Hypernatremia is diagnosed when levels rise above 145. Mild cases may not cause symptoms, but severe hypernatremia can be dangerous. It affects your brain and nervous system the most. Catching high sodium early through blood testing helps prevent serious complications.
Symptoms
- Intense thirst and dry mouth
- Confusion or difficulty thinking clearly
- Muscle weakness or twitching
- Fatigue and low energy
- Restlessness or irritability
- Difficulty sleeping
- Nausea and vomiting
- Rapid heartbeat
- In severe cases, seizures or loss of consciousness
Some people with mild hypernatremia may not notice symptoms right away. Older adults and infants are especially vulnerable because they may not feel thirst as strongly. Symptoms become more obvious as sodium levels continue to rise.
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Causes and risk factors
Dehydration is the leading cause of hypernatremia. When you lose more fluid than you take in, sodium becomes concentrated in your blood. This can happen from not drinking enough water, excessive sweating, vomiting, or diarrhea. Fever and hot weather increase your risk. Diuretic medications, sometimes called water pills, can also cause your body to lose too much water relative to sodium.
Certain medical conditions disrupt how your body regulates water balance. Diabetes insipidus is a disorder where your kidneys cannot concentrate urine properly, leading to excessive water loss. Kidney disease can affect sodium regulation. Endocrine disorders like Cushing syndrome or hyperaldosteronism cause hormonal imbalances that affect sodium levels. Rarely, consuming excessive amounts of salt or sodium-containing medications can lead to high sodium. Older adults, people with limited mobility, and those with impaired thirst response face higher risk.
How it's diagnosed
Hypernatremia is diagnosed through a simple blood test that measures your sodium level. Your doctor will check your sodium along with other electrolytes like potassium, chloride, and carbon dioxide. These tests show how well your kidneys are working and whether other imbalances exist. A complete metabolic panel provides a full picture of your electrolyte and kidney function.
Rite Aid offers sodium testing through our flagship blood panel at Quest Diagnostics locations nationwide. Testing twice per year helps you catch sodium imbalances early. Your doctor may also order urine tests to understand why your sodium is high. They will ask about your fluid intake, medications, and symptoms. Identifying the underlying cause helps guide treatment.
Treatment options
- Drink more water and fluids to restore balance. Do this gradually under medical supervision for severe cases.
- Reduce sodium intake by avoiding processed foods, salty snacks, and adding extra salt to meals.
- Treat underlying conditions like diabetes insipidus or kidney disease.
- Adjust medications that may be contributing to water loss.
- In hospital settings, intravenous fluids may be given to slowly lower sodium levels.
- Monitor sodium levels regularly through blood tests to ensure treatment is working.
- Work with a doctor or nutritionist to create a meal plan that supports healthy sodium levels.
Concerned about Hypernatremia? Get tested at Rite Aid.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
Hypernatremia is diagnosed when blood sodium levels exceed 145 milliequivalents per liter. Normal sodium ranges from 135 to 145. Mild hypernatremia is 146 to 149, moderate is 150 to 159, and severe is 160 or higher. Severe cases require immediate medical attention.
Yes, dehydration is the most common cause of hypernatremia. When you lose water through sweating, vomiting, diarrhea, or simply not drinking enough, sodium becomes more concentrated in your blood. This is especially common in hot weather or during illness. Drinking adequate water usually prevents this.
Sodium levels should be lowered slowly to avoid brain swelling. Rapid correction can cause serious complications. Doctors typically aim to reduce sodium by no more than 10 to 12 milliequivalents per liter in 24 hours. Severe cases require hospitalization with careful monitoring.
Yes, severe hypernatremia can be life threatening. High sodium causes brain cells to shrink, leading to confusion, seizures, or coma. Even mild cases can affect muscle function and thinking. Early detection through blood testing helps prevent dangerous complications. Prompt treatment is essential.
Older adults face higher risk because they may not feel thirsty or have limited access to water. Infants and young children are vulnerable because they cannot communicate thirst. People with diabetes insipidus, kidney disease, or those taking diuretics also have increased risk. Anyone with impaired mobility or consciousness is at risk.
Diabetes insipidus is a disorder where your kidneys cannot concentrate urine properly. This causes your body to produce large amounts of dilute urine, leading to excessive water loss. As you lose water, sodium becomes concentrated in your blood. This condition is different from diabetes mellitus, which affects blood sugar.
Yes, diuretic medications can cause hypernatremia by making you lose more water than sodium. Some antibiotics and medications for seizures may also affect sodium balance. Always tell your doctor about all medications you take. They may adjust doses or monitor your sodium levels more frequently.
If you have risk factors like kidney disease or diabetes insipidus, testing every 3 to 6 months is wise. Rite Aid offers sodium testing twice per year as part of our preventive health program. Your doctor may recommend more frequent testing if you have symptoms or are adjusting medications.
Limit processed foods like canned soups, deli meats, frozen dinners, and fast food. Avoid adding extra salt to meals. Read nutrition labels and choose items with less than 140 milligrams of sodium per serving. Focus on fresh fruits, vegetables, and whole grains. Drink plenty of water throughout the day.
Yes, staying well hydrated is the best prevention. Drink water regularly, especially in hot weather or during exercise. Monitor fluid intake if you take diuretics or have kidney problems. Limit high sodium foods and avoid excessive salt. Regular blood testing helps catch imbalances before symptoms appear.