In a nutshell, what is overactive thyroid?

Overactive thyroid: The thyroid makes too much hormone. Causes include: graves disease, inflammed thyroid, taking too much thyroid hormone, taking too much iodine, a thyroid growth, and rarely tumors of the testes or ovaries. Symptoms: nervousness, more sweatings, fatigue, can't stand heat, weight loss, more bowel movements, more appetite. Signs: high blood pressure, hand tremor, clammy skin, rapid pulse, flushing..

Excess hormone: The thyroid makes hormones that regulate metabolism. An over active thyroid makes too much. So everything's faster or working harder- heart rate, intestines, sweat glands, etc.