Thyroid cysts generally do not affect pregnancy because they are merely morphological changes, meaning enlarged cystic nodules found in the thyroid. These nodules are typically fluid-filled and often non-functional, so they do not significantly impact pregnancy. However, since the thyroid can develop such cystic nodules or cysts, there might also be some functional manifestations. In other words, there could be both cysts and other thyroid function issues concurrently, which might affect pregnancy. Therefore, when thyroid issues are detected, it is necessary to undergo thyroid function tests before planning a pregnancy to determine whether it is safe to conceive and if there will be any impact on pregnancy.