Thyroid nodules usually do not go away after pregnancy if you have thyroid nodules. Thyroid nodules refer to lumps in the thyroid gland. There are many causes of thyroid nodules, such as thyroiditis and hyperthyroidism, which can occur in patients with thyroid nodules. Generally, multiple nodules are more common, while single nodules have a higher possibility of cancer, so patients with thyroid nodules should go to the hospital for checkups, which can include thyroid ultrasound and thyroid function tests. For fast-growing and hard single nodules, surgery should be performed as early as possible because of the relatively high possibility of malignancy. Multiple thyroid nodules with hyperthyroidism can also be treated with surgery.