I recently got my thyroid tested. The results were high TSH but normal T3 and T4. I also didn't test for antibodies. What could cause this?

High TSH levels with normal T3 and T4 typically indicate subclinical hypothyroidism, which may be caused by factors such as iodine deficiency, early Hashimoto's thyroiditis, or other thyroid gland dysfunctions. The absence of thyroid antibodies in your tests means autoimmune thyroid disease is less likely, but it would be beneficial to test for them to rule out Hashimoto's. Other potential causes can include medications or pituitary gland issues. Consulting with a healthcare provider can help determine the underlying cause and the best course of action.