I was diagnosed with hyponatremia in September, 2012 after spending 3 months enduring the awful symptoms until a doctor finally figured it out. I have noticed this summer that I have very little tolerance to heat. I walk outside to my car and am already hot and sweat pours down my body. I do not spend a lot of time outdoors but have noticed this summer a change in how I react to heat. Could it be due to the hyponatremia? Just wondering if anyone else has had this happen to them.