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:
In European Cars. In weights and measures, it stands for milligrams (or  milligrammes), 1/1000 of a gram.    In automobiles, it stands for Morris Garages. The new owners of MG,  Nanjinâ¦g Automobile Group, would like it to become to mean 'Modern  Gentleman' to reflect the lifestyle market it is trying to attract.