A thyroid nodule is a small tumor that appears in part of the thyroid tissue. Therefore, these tumors may be benign or malignant. The diagnosis can only be confirmed by surgical removal of the tumor for pathological examination. However, ultrasound is now a good indicator of good or bad thyroid nodules. However, not all nodules with unclear borders found on ultrasound are malignant, so you don’t have to worry too much. Many thyroid disorders can cause nodules in the thyroid, including hyperthyroidism. But in any case, if a nodule develops in the thyroid and meets the criteria for surgery, surgery is usually required. There are many causes of thyroid nodules, including hyperthyroidism and Hashimoto’s thyroiditis; in some areas, iodine deficiency and excessive consumption of iodine-rich foods can also cause thyroid nodules. In addition, endocrine, environmental and emotional factors can also trigger nodules in the thyroid gland. Pregnancy may contribute to the enlargement of thyroid nodules because the placenta contains hormones that promote tumor growth, but the exact size of the nodules varies from person to person. If a thyroid nodule is suspected to be bad before pregnancy, surgery is recommended as it may not only grow but also metastasize if the tumor grows after pregnancy due to hormonal effects. If the nodule is considered benign, it can be removed surgically first, or you can wait until after you have the baby. Based on your ultrasound results, I guess your thyroid nodule is benign, so you can have two options. If you are really worried, you can do a fine needle aspiration test on the poorly defined nodule on your right side to find out if it is good or bad.