Re: Hyponatremia (Low Sodium)
A lot depends on the degree of hyponatremia, but basically water stays with salt in your body, so if you eat a lot of salt you are likely to retain water with it. The ADH hormone comes from the pituitary, and regulates water balance only. It tells the kidneys to save water when needed, like if BP drops. Sometimes people have Secretion of Inappropriate (high) ADH (SIADH), which causes water retention, diluting your sodium in the blood. It is not a matter of having too little sodium but rather having too much water diluting sodium. Osmolality measures the concentration of urine or serum, and in SIADH, the osmolality will be low in serum and high in urine because kidneys are conserving too much water in the body. That may be why your urine looks dark (concentrated). It is a rather uncommon problem, but sometimes is drug induced, so if you are on any medications, I would check every one for that side effect. Your Dr seems knowlegable, must be an endo? Low sodium can also be caused by kidneys releasing too much sodium, which can be from adrenal or aldosterone insufficiency. That is why he is checking urine sodium. These hormone things get complicated, but I think you will get answers. Low sodium (Na+) causes muscle cramps.
Last edited by ladybud; 09-27-2012 at 01:51 PM.