Hyponatraemia is a condition characterised by lack of sodium (salts) in the blood and body fluids. Sodium in the body fluids is important for maintaining blood pressure and also facilitates the functions of nerves and muscles. When there is not enough sodium in body fluids, the body’s cells fill up with water in an attempt to obtain more sodium (which should be found in the fluid). This causes the cells to swell and can be dangerous in brain cells. Symptoms of hyponatraemia include altered consciousness, headaches, muscle weakness, fatigue, vomiting and convulsions.
For more information, see Hyponatraemia.
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