Not sure if there is a thread about it. Who has issues? I hada blood test done and found out I have low thyroid. After many blood tests this one finally came up even tho I was tested for it 5 months ago. Hypothyroidism is the reduced activity of the thyroid gland (underactive thyroid) leading to a decrease in circulating thyroid hormones. This slows the metabolic activity within the body. Hyperthyroidism (thyrotoxicosis) is the increased activity of the thyroid gland (overactive thyroid) resulting in an increase in the level of thyroid hormones circulating in the blood. This speeds up the metabolic activity within the body. There are many causes of both hypo- and hyperthyroidism but the most common cause in both instances are autoimmune diseases Hashimotos thyroiditis (hypothyroidism) and Graves disease (hyperthyroidism). ========================================================== Hypothyroidism: Weight gain. Cold intolerance, Fatigue. Slow and sluggish. Sleepiness. Depression. Poor memory. Inability to concentrate. Costipation,Heavy flow. Prolonged or frequent periods Hyper: Weight loss. Heat intolerance, Fatigue but hyperactive. Cannot sit still, Anxious. Irritable. Nervousness, Diarehea, Lighter flow. Absent or infrequent periods What is bold is my symptoms. So why did the doctor dianosed me with hypothyroidism and not hyper? Which is where most of my symptoms are.