Question: what causes hyponatremia signs and symptoms?
Answer: Certain medications. ... 
Heart, kidney and liver problems. ... 
Syndrome of inappropriate anti-diuretic hormone (SIADH). ... 
Chronic, severe vomiting or diarrhea and other causes of dehydration. ... 
Drinking too much water. ... 
Hormonal changes. ... 
The recreational drug Ecstasy.