An over active thyroid can cause a person to sweat or feel very sensitive to the heat. This is because the condition can cause the heart beat too fast and metabolism increases therefore producing excess heat, explains Thyroid UK.
An overactive thyroid or hyperthyroidism occurs when the thyroid gland, situated in the neck, produces too much thyroxine, the hormone related to the thyroid. Thyroxine is responsible for controlling the body's metabolic rate, therefore too much will speed the rate up, according to NHS choices.
Thyroid UK reports there are many other symptoms related to an over active thyroid including shortness of breath, frequent mood swings, feeling tired and bloodshot eyes.
As these symptoms are common of other illnesses and conditions NHS choices recommends seeing a Physician to test for an overactive thyroid. This involves reviewing the symptoms experienced and taking a blood test to measure the amount of thyroid hormone in the body's system.
According to NHS choices, there are many ways of treating an overactive thyroid depending on the severity and response to treatment. These range from medication to stop the thyroid gland producing so much hormone, to radiotherapy, to removing part or all of the thyroid gland surgically.