An overactive thyroid is the result of the thyroid producing an excess of the two circulating hormones Thyroxine (T4) and triiodothyronine (T3). Hyperthyroidism can be caused by the autoimmune disease called Graves's disease, or thyroiditis, an inflammation of the thyroid gland. Hyperthyroidism can cause a wide range of symptoms.
Those with an overactive thyroid may experience bulging of the eyes caused by inflammation of the tissue surrounding the eye.
Hyperthyroidism can lead to an increased metabolism, resulting in increased hunger, but with weight loss.
Muscle and Joint Pain
Some may experience carpal tunnel syndrome, and muscle weakness, pain and stiffness. Arthropathy, known as joint disease, can result in difficulty climbing and holding objects. The throat can become swollen, causing hoarseness and problems with swallowing.
Palpitations, an increased heart rate, and difficulty breathing are signals of a possible overactive thyroid.
A common symptom of hyperthyroidism is fatigue and the lack of energy to perform daily activities.
Those who have hyperthyroidism may suffer from nervousness, insomnia and irritability.