Hyperthyroidism is a health condition which results from the overactivity of the thyroid gland. It can be diagnosed by the presenting history and a physical examination, in addition to several tests to confirm the diagnosis and investigate the cause of the condition.
Physical Examination
A physical examination is an important part of the diagnostic process to investigate for any signs or symptoms that may be indicative of hyperthyroidism. Typical symptoms of hyperthyroidism may include:
- Enlarged thyroid gland
- Heart palpitations
- Hand tremor
- Clammy skin
- Increased appetite with loss of weight
- Protrusion of the eyes
An enlarged thyroid gland is often visible, particularly in more severe cases. It appears as a lump or several lumps at the front of the base of the neck, below the voice box.
It is also important that the patient consultation allows the individual to report any other symptoms that may be related to the condition, such as nervousness or skin changes. Hyperthyroidism can cause a range of symptoms, depending on the specific case.
Symptoms of thyrotoxicosis range from warm moist skin and staring eyes, to tremors of the outstretched arm and muscle weakness.
Examination of the eyes and the skin
Approximately half of patients with Graves’ disease have eye symptoms such as protruding eyes, difficulty in complete lid closure, swelling of the conjunctiva and double vision. Pretibial myxedema refers to thickening of the skin over the lower leg.
Thyroid Function/Blood Tests
Blood test to measure the concentration of the thyroid hormones thyroxine (T4) and triiodothyronine (T3), in addition to thyroid stimulating hormone (TSH), are essential to confirm the diagnosis of hyperthyroidism. This also helps to narrow down the diagnosis and exclude other conditions with similar symptoms.
Individuals with hyperthyroidism will have unique blood test results, showing a low concentration of TSH and high levels of T3 and T4. TSH is usually secreted from the pituitary gland and stimulates the thyroid gland to produce more hormones. In hyperthyroidism, the levels of thyroid hormones are higher than normal, despite lower than normal TSH production.
Some individuals may have blood test results which show normal levels of T3 and T4 but lower levels of TSH than normal. This is known as subclinical overactive thyroid gland. This condition does not usually require treatment, and often the hormone levels return to normal spontaneously within several weeks or months. It is best to monitor the hormone levels and manage appropriately if the T3 and T4 concentrations become elevated.