Diseases like Hashimoto’s disease where the immune system attacks the thyroid, can often cause hypothyroidism. This disease is the most common cause of hypothyroidism in the U.S. Other autoimmune diseases can act in a similar way and cause the condition.

Undergoing surgery to remove parts or all of your thyroid gland can reduce or completely stop thyroid hormone production and lead to hypothyroidism.

Radiation therapy is used to treat cancers. Unfortunately, if radiation therapy is used on the head or neck, the radiation could affect the thyroid and cause hypothyroidism.

Certain medications may cause hypothyroidism, especially ones that treat psychiatric disorders. It’s important to talk to your doctor about all side effects of any potent medication regime you begin.

When babies are born with an underdeveloped thyroid or with no thyroid at all, they are born with an inherited form of hypothyroidism. Fortunately, most states now require newborn thyroid screening in order for parents to take the best next steps for their babies.

When the pituitary gland does not function properly and does not produce enough thyroid stimulating hormones, hypothyroidism can occur. This malfunctioning can be caused by a benign tumor in the pituitary gland.

During or after pregnancy, a woman may develop hypothyroidism, often because they produce antibodies to their own thyroid gland. Left untreated, this could prove harmful to both mother and baby.

Iodine is mostly found in seafood and seaweed and is crucial in the proper functioning of the thyroid. It’s important to regulate intake as too much iodine might also cause hypothyroidism. If you have any reason to suspect you might have hypothyroidism due to symptoms, do research, and consult a doctor.

Hyperthyroidism is a condition where the thyroid gland is overactive and produces too much thyroid hormones. This can result in sudden weight loss, irregular heartbeat, and nervousness. Sometimes by treating a hyperthyroid condition, hypothyroidism can occur.