Hypothyroidism has consequences in all major systems of your body. It affects all functions of your cells and, for that reason, all your vital functions are affected as well. Your digestive system works every day to process the food that you eat, absorb all nutrients necessary for your normal functions, and then excrete the remaining, indigestible parts of food.
When your bowels don’t have enough dynamism, they move less and perform their function more slowly. Your larger intestine in particular, which is the last portion of your digestive system before final excretion, absorbs water contained in the aliments and sends it right to your bloodstream for it to be distributed around your body.
The longer your fecal matter remains inside your large intestines, the more water they absorb, and the dryer it becomes. Dry fecal matter flows less and is more difficult to excrete, and thus causes constipation.