An abnormal lab result is not always a sign of trouble. Further investigation is warranted, however, and it sounds as though your doctor is taking good care of you.

In general, low sodium levels in the bloodstream (medical term: hyponatremia, pronounced hypo-nuh-TREE-me-uh) may be linked to taking water pills, chronic diarrhea, kidney problems, or profuse sweating (medical term: hyperhidrosis). Characteristic symptoms may include fatigue, headache, and abdominal cramps.