Diffuse changes in the thyroid gland with nodules in the right lobe is a descriptive diagnosis of the thyroid gland, and the causes of the condition include nodular goiter, subacute thyroiditis, Hashimoto’s disease, and thyroid tumors. 1. Nodular goiter: It is a compensatory enlargement of the thyroid gland and is closely related to iodine deficiency. The thyroid gland is stimulated by TSH levels, resulting in diffuse and nodular changes. 2. Subacute thyroiditis: This condition may be closely related to viral infections, and the autoimmune reaction that occurs after infection leads to diffuse changes in the thyroid gland and localized nodules. 3. Hashimoto’s disease: an autoimmune disease, accompanied by damage to the follicular epithelium, leading to diffuse damage to the thyroid gland. 4. Tumors: Thyroid tumors can also cause corresponding changes, with the proliferation of tumor cells will cause corresponding changes. The presence of diffuse thyroid gland changes with right-sided nodules requires timely medical attention and standardized treatment under the guidance of clinicians.