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Hyponatremia: Causes, Symptoms and Treatment

Hyponatremia is a condition in which sodium levels in the blood are abnormally low. It can range from mild to life-threatening and requires medical evaluation.

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Things worth knowing about "Hyponatremia"

Hyponatremia is a condition in which sodium levels in the blood are abnormally low. It can range from mild to life-threatening and requires medical evaluation.

What is Hyponatremia?

Hyponatremia is an electrolyte disorder characterized by a serum sodium concentration below 135 mmol/l. Sodium is an essential mineral that regulates fluid balance, nerve impulse transmission, and muscle contraction. When sodium levels fall too low, the brain and other organs can be seriously affected.

Causes

Hyponatremia can result from a wide variety of causes:

Excessive fluid intake: Drinking too much water in a short period of time (water intoxication)
Heart failure, liver disease, or kidney disease: These conditions lead to fluid retention in the body
Medications: Especially diuretics, antidepressants, and certain pain medications
Hormonal disorders: Such as the syndrome of inappropriate antidiuretic hormone secretion (SIADH), Addison's disease, or hypothyroidism
Vomiting and diarrhea: Significant sodium loss through the gastrointestinal tract
Heavy sweating: For example, during endurance sports without adequate electrolyte replacement

Symptoms

The severity of symptoms depends on how low the sodium level is and how quickly it has fallen:

Headache and nausea
Fatigue and general weakness
Confusion and disorientation
Muscle cramps or weakness
Seizures (in severe hyponatremia)
Loss of consciousness or coma (in extreme cases)

Mild hyponatremia often causes no symptoms and is discovered incidentally during routine blood tests.

Diagnosis

Diagnosis is primarily made through a blood test measuring serum sodium levels. Additional tests typically include:

Urine analysis to assess sodium excretion and osmolality
Serum osmolality to evaluate fluid status
Hormone levels (e.g., ADH, TSH, cortisol) to identify underlying causes
Kidney function markers (creatinine, urea)

Treatment

Treatment depends on the underlying cause, severity, and speed of onset:

Mild hyponatremia: Fluid restriction and treatment of the underlying condition
Medication-induced hyponatremia: Adjusting or discontinuing the causative drug
Sodium replacement: In severe or symptomatic cases, intravenous saline (NaCl) infusion
Vaptans: Medications that promote water excretion through the kidneys (e.g., tolvaptan for SIADH)

Important: Correcting sodium levels too quickly can trigger a dangerous complication called osmotic demyelination syndrome. Correction must therefore be gradual and medically supervised.

When to Seek Medical Attention?

Call emergency services immediately if someone experiences confusion, seizures, severe weakness, or loss of consciousness. Less severe but persistent symptoms such as nausea, headache, or fatigue should also be evaluated by a doctor, especially in individuals with known risk factors.

References

Spasovski G et al. - Clinical practice guideline on diagnosis and treatment of hyponatraemia. European Journal of Endocrinology, 2014. Nephrology Dialysis Transplantation, 29(Suppl 2): i1-i39.
Hoorn EJ, Zietse R - Diagnosis and Treatment of Hyponatremia: Compilation of the Guidelines. Journal of the American Society of Nephrology, 2017; 28(5): 1340-1349.
Verbalis JG et al. - Diagnosis, Evaluation, and Treatment of Hyponatremia: Expert Panel Recommendations. The American Journal of Medicine, 2013; 126(10 Suppl 1): S1-S42.

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