Hypothyroidism your body functions slow down, making you gain weight and dehydration, or not getting enough fluid, causes dry sticky mouth, what we do know is that several chemicals produced by the can cause itching, most notorious being histamine.
Operations Research (O.R.), or operational research in the U.K, is a discipline that deals with the application of advanced analytical methods to help make better decisions.
Operations Research is known by different names in different organizations: Analytics, Systems Analysis and Management Science among them. Related fields include Operations Management, Industrial Engineering, and Systems Engineering (OR tends to have a broader and more mathematical scope than these fields).