Which term best describes an increased production of gas in the intestine?

The term that best describes an increased production of gas in the intestine is flatulence. Flatulence refers specifically to the buildup of gas in the gastrointestinal tract that is expelled through the rectum. This phenomenon can occur for various reasons, including dietary choices, digestive disorders, or swallowing air.

Borborygmus, while related to sounds in the gastrointestinal tract, refers to the rumbling or gurgling noises produced by the movement of gas and fluid in the intestines, not the production of gas itself. Constipation involves difficult or infrequent bowel movements, which is not directly related to gas production. Diarrhea is the condition characterized by frequent, watery bowel movements, also not associated with increased gas in the intestines. Thus, flatulence is the term that accurately encapsulates the increase in intestinal gas production.