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:
A milligram is a unit of mass in the Metric System. The symbol for milligram is mg. The base unit for a milligram is gram and the prefix is milli. The prefix milli is derived from the Latin mille meaning one thousand and is symbolized as m in the Metric System. Milli denotes a factor of one thousandth (1/1000th) which means that there are 1,000 milligrams in a gram.