High TSH levels are associated with hypothyroidism, so the two terms are often used interchangeably. This occurs when the thyroid is not making enough T4 and T3, so the pituitary gland continues to make TSH to stimulate the thyroid. Some forms of hypothyroidism or high TSH are permanent, such as when surgery completely removes the thyroid. However, high levels of TSH can also occur after pregnancy or illness and are easily rectified, sometimes even doing so on their own.

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