Step-by-step explanation:
According to the American Cancer Society, most cases of thyroid cancer are found early and have a high cure rate. However, if left untreated or undetected for a long period of time, thyroid cancer can spread to other parts of the body and become more difficult to treat.
The length of time that a person can have thyroid cancer without knowing also depends on the type of thyroid cancer. For example, papillary thyroid cancer is the most common type of thyroid cancer and tends to grow slowly. In many cases, it may take several years for papillary thyroid cancer to grow large enough to cause symptoms or be detected.