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mm Hg Millimetres of mercury. A measure of blood pressure, referring to the height to which the pressure in the blood vessels push a column of mercury. mmHg stands for millimetres of mercury, a unit of pressure used to measure blood pressure. Learn more about the meaning, usage and translations of mmHg in different languages. Explanation "mmHg" stands for millimeters of mercury. It is a unit of measurement often used in medicine to measure blood pressure. The term comes from the use of mercury in the first accurate pressure gauges and it's still being used today as the standard unit of measurement for pressure in the medical field. It's like how a ruler measures length in inches or centimeters, but instead, mmHg measures the pressure or force that your blood exerts on the walls of your blood vessels. What does MMHG mean? Mayflower Municipal Health Group (MMHG) is a municipal joint purchase group for health, dental and life insurance in Plymouth, Massachusetts, United States.