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:
One milligram is one thousandth of a gram and one thousand micrograms. A milligram is generally abbreviated as mg. One microgram is one millionth of a gram and one thousandth of a milligram. It is usually abbreviated as mcg or ug. Mcg and ug are the same. The IU is an International Unit, usually used to measure fat soluble vitamins including Vitamin A, D and E. The conversion of IU to mg varies depending on the nutrient.