What causes hyponatremia?
A low sodium level in your blood may be caused by too much water or fluid in the body. This “watering down” effect makes the amount of sodium seem low. Low blood sodium can also be due to losing sodium from the body or losing both sodium and fluid from the body.
Hyponatremia can be the result of illnesses and medications. Some causes that may be related to kidney disease include:
- Kidney failure – the kidneys cannot get rid of extra fluid from the body
- Congestive heart failure – excess fluid builds up in the body
- Diuretics (water pills) – makes the body get rid of more sodium in the urine
- Antidepressants and pain medication – may cause more sweating or urinating than normal
- Severe vomiting or diarrhea – the body loses a lot of fluid and sodium
- Excessive thirst (primary polydipsia) – causes too much fluid intake