Low thyroid hormone levels (T4 and T3) slow all of your body systems, including gastric motility, leading to constipation. Thyroid medication replaces the thyroid hormones that your thyroid gland fails to produce.

Does thyroid medication affect bowel movements?

Hypothyroidism, or low levels of thyroid hormone, can have many effects on your health, including your bowel movements.

Is my thyroid making me constipated?

Hypothyroidism, or too little thyroid hormone in the body, can cause the body's processes to slow down. This may cause symptoms such as fatigue, dry skin, depression, constipation, forgetfulness and weight gain.