There are many causes of constipation, for example, medications; poor bowel habits; low fiber diets; possibly abuse of laxatives; hormonal disorders; diseases primarily of other parts of the body that also affect the colon; and high levels of estrogen and progesterone during pregnancy.
mg: Abbreviation for milligram, a unit of measurement of mass in the metric system equal to a thousandth of a gram. A gram is equal to the mass of one milliliter, one thousandth of a liter, of water at 4 degrees C. MG (in capital letters) is the abbreviation for the disease myasthenia gravis. Search MedTerms:
definition of a mg a milligram mg is a metric system unit that represents a thousandth of a gram because of its larger size a mg is a more commonly used measurement than a mcg one thousandth of a mg is one mcg and 1000 mcg equal one mgn the international system of units measurements the mcg is one of the smallest frequently used units to convert milligrams to micrograms multiply 1000 by the mass for instance if the mass is 1 25 mg multiply by 1000 to get 1250 mcg