Regardless of the cause, you are likely to want to stop the diarrhea as soon as possible. However, for a pregnant woman, taking anti-diarrhea medications isn't safe, so other methods to stop the diarrhea must be used.
vital, adj necessary to or pertaining to life. vital capacity, n a measurement of the amount of air that can be expelled at the normal rate of exhalation after a maximum inspiration, representing the greatest possible breathing capacity.ital capacity. the greatest volume of gas that, following maximum inspiration, can be expelled during a complete, slow, unforced expiratory maneuver; equal to inspiratory capacity plus expiratory reserve volume. This is a commonly made and practicable measurement in humans but is not so in animals.
essential refers to something that is part of the basic nature or character of a thing and is vital to its existence or functioning: Water is essential to life. necessary 1. used with an infinitive If it is necessary to do a particular thing, that thing must be done. It is necessary to act fast. It is necessary to examine the patient carefully. 2. used with 'for' You can say that it is necessary for someone to do something. It was necessary for me to keep active and not think about Sally.