Hysteroscopy is frequently used to assist the diagnosis and treatment of a series uterine diseases. However, complications associated with the procedure including fluid overload, hyponatremia, hypo-osmolality, hemorrhage, uterine perforation, and air embolism have been reported. The incidence of fluid overload with hyponatremia during hysteroscopic procedures has been reported to be up to 6% and it can probe fatal. Thus, early recognition of this condition and prompt intervention thereof is important to prevent adverse sequelae. Here, we report a case of hyponatremia with incidental fluid overload during hysteroscopy. We detected the signs of complication early on and were thus able to manage it promptly without any resulting adverse sequelae.