Hyperthyroidism is not cancer. Hyperthyroidism and cancer are two diseases that are completely unrelated. Hyperthyroidism is a common disease of the endocrine system and refers to abnormal thyroid function, which is benign and can be cured. Cancer, on the other hand, refers to abnormalities in the morphology and cytology of the thyroid gland and is a malignant disease for which there are not many treatment options available and a complete cure cannot be achieved at this time. The diagnosis of hyperthyroidism depends on hematological tests, while thyroid cancer depends on ultrasound abnormalities and pathological findings.