Hyponatremia is a common electrolyte abnormality often detected asymptomatically it is also common is hospitalized patients also this study was conducted in Telangana and Andhra Pradesh. in 200 hospitalized patients 60 patients were having hyponatremia where serum sodium is less than 135 M.Eqll /lt. and average age is 62 years. Males patients are 45% and female patient are 55%. Cases of mortality were progressive real failure and sepsis.