It is not possible to generalize what will eventually happen to diffuse thyroid lesions, but lesions such as hypothyroidism, hyperthyroidism or thyroid tumors may occur. 1. Hypothyroidism: The full name of hypothyroidism is hypothyroidism. When diffuse thyroid lesions continue to develop, they may impair thyroid function, leading to the development of hypothyroidism. 2. Hyperthyroidism: The full name of hyperthyroidism is hyperthyroidism. If the thyroid gland is diffusely diseased and the internal tissues of the thyroid gland proliferate, the symptoms of hyperthyroidism may occur. 3. Thyroid tumor: If diffuse thyroid lesions continue to develop, a tumor of the thyroid gland may form. When diffuse thyroid lesions occur, it is necessary to consult a doctor in time for thyroid hormone and other examinations to clarify the cause of diffuse thyroid lesions, and carry out targeted treatment according to the cause.