What happens when you stop taking hypothyroidism medication?

Low thyroid levels: Most people need to thyroid hormone(th) forever because their thyroid can't make enough. Stopping th leads to low thyroid levels, and feeling cold, sluggish, constipated, not interested in doing anything, sleeping a lot, rough skin, and gaining weight. Since these changes take weeks to occur, people may lose insight that things aren't right, they may go untreated for months or even years.