Condition of low potassium levels in blood is called hypokalemia. This condition can develop because of loss of excessive potassium in urine & GI tract due to vomiting, diarrhea, use of medicines like diuretics, renal impairment, eating disorders, excessive use of laxatives, and increased levels of a hormone called aldosterone. Symptoms of hypokalemia are muscle cramps, weakness, fatigue, abnormal heartbeat and constipation. So, hot flashes are not caused by low potassium levels directly. Hot flashes in younger women can occur before start of periods due to hormonal changes and in premenopausal ladies. In male, it is usually associated with the removal of prostate gland.