The following is a list of English-speaking population by country, including information on both native speakers and second-language speakers.
Sodium plays many important roles in the body. It maintains fluid balance and is a main nutrient used in nerve impulse transmission and muscle contraction. The normal range for blood sodium is between 135 and 145 mEq/L (3.10 mg/ml to 3.34 mg/ml). Higher levels of sodium are normally associated with hypertension. A sodium level of 150 mEq/L (3.45 mg/ml) or more is known as hypernatremia, a condition that is commonly caused by dehydration or eating too much salt. However it can also be caused by other conditions such as diabetes or hormonal imbalances.
Low sodium level. Low sodium level is a condition in which the amount of sodium (salt) in the blood is lower than normal. The medical name of this condition is hyponatremia. Sodium is found mostly in the body fluids outside the cells. It is very important for maintaining blood pressure. Sodium is also needed for nerves, muscles, and other body tissues to work properly. When the amount of sodium in fluids outside cells drops below normal, water moves into the cells to balance the levels. This causes the cells to swell with too much water.