Hyperthyroidism, or overactive thyroid, happens when the thyroid gland produces too much thyroid hormone.It can cause a variety of symptoms, including:
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High metabolic rate
High amounts of T4, T3, or both can cause an excessively high metabolic rate. This is called a hypermetabolic state. When in a hypermetabolic state, you may experience a rapid heart rate, elevated blood pressure, and hand tremors. You may also sweat a lot and develop a low tolerance for heat.
Hyperthyroidism can also cause atrial fibrillation, a dangerous arrhythmia that can lead to strokes, as well as congestive heart failure.
Eye problems
Graves’ ophthalmopathy is an eye condition associated with Graves’ disease. It can cause red, swollen and bulging eyes, as well as sensitivity to light and double vision.
Osteoporosis
Hyperthyroidism can lead to thinning or brittle bones, or osteoporosis. This is because excess thyroid hormone prevents the body from using calcium, a bone-strengthening mineral.
Skin problems
Graves’ dermopathy is a rare condition in which the skin, often on the child’s shins and feet, becomes red and swollen.
Thyrotoxic crisis (thyroid storm)
This is a sudden onslaught of symptoms such as rapid heart rate and fever. If you think your child is experiencing a thyrotoxic crisis, you should always seek immediate medical care.
Other symptoms of hyperthyroidism include:
- weight loss
- irregular menstrual cycles
- more frequent bowel movements
- increased appetite
- nervousness
- restlessness
- inability to concentrate
- weakness
- irregular heartbeat
- difficulty sleeping
- fine, brittle hair
- itching
- hair loss
- nausea and vomiting
- breast development in men
The following symptoms require immediate medical attention:
- dizziness
- shortness of breath
- loss of consciousness
- fast, irregular heart rate
References:
http://www.healthline.com/health/hyperthyroidism#symptoms3
http://www.childrenshospital.org/conditions-and-treatments/conditions/hyperthyroidism/symptoms-and-causes
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