Subclinical hyperthyroidism (SCHyper) is a biochemical diagnosis characterized by a decreased serum thyroid-stimulating hormone (TSH) and normal serum thyroxine (T4) and triiodothyronine (T3) concentrations.

Hyperthyroidism is characterized by hypermetabolism and elevated serum levels of free thyroid hormones. Symptoms include palpitations, fatigue, weight loss, heat intolerance, anxiety, and tremor. Diagnosis is clinical and with thyroid function tests. Treatment depends on cause.

Dear E.G.: Large amounts of elemental calcium do decrease the absorption of the thyroid hormone, thyroxine (Synthroid and others). If you were to take thyroxine at the same time as a large calcium.

What is hyperthyroidism? Hyperthyroidism, or overactive thyroid, happens when your thyroid gland makes more thyroid hormones than your body needs. Your thyroid is a small, butterfly-shaped gland in the front of your neck. It makes hormones that control the way the body uses energy.

Graves' disease is an immune system disorder that results in the overproduction of thyroid hormones (hyperthyroidism). Although a number of disorders may result in hyperthyroidism, Graves' disease is a common cause. Thyroid hormones affect many body systems, so signs and symptoms of Graves' disease can be wide ranging.

Hypothyroidism can easily be treated with a thyroid hormone supplement taken once a day (see Hypothyroidism brochure). Radioactive iodine has been used to treat patients for hyperthyroidism for over 60 years and has been shown to be generally safe.

Common symptoms include: Unplanned weight loss. Rapid heartbeat, abnormal heartbeat, or pounding of the heart. Nervousness, anxiety, or touchiness. Tremors (trembling of the hands and fingers) Changes in menstrual patterns, such as lighter flow or less frequent periods, in women. Increased sensitivity to heat.