High thyrotropin may be caused by primary hypothyroidism with hypothyroidism Hashimoto’s disease, exogenous thyrotropin-secreting tumors (e.g., lungs, breasts), and recovery from subacute thyroiditis, which need to be definitively diagnosed and treated by a medical professional. In addition to the above factors, ingestion of lithium metal, potassium iodide, and thyrotropin-releasing hormone can also increase thyrotropin. The normal range of thyrotropin is 0.35-5.5μIU/ml. Due to different testing methods and reagents, the reference indexes vary from hospital to hospital and need to be analyzed specifically. When thyrotropin is found to be on the high side, one should consult a doctor in time to avoid delaying the condition.