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Graves' Disease

Graves' disease is an autoimmune disorder that causes the thyroid to become overactive, leading to weight loss, rapid heartbeat, anxiety, and eye changes. Medication, radioiodine, or surgery can restore normal levels.

Endocrine
Graves' disease is an autoimmune disorder in which the immune system produces antibodies that switch the thyroid gland into overdrive. It is the most common cause of an overactive thyroid (hyperthyroidism) in the United States. Graves' disease most often affects women and typically begins between the ages of 30 and 50, although anyone can develop it. Because thyroid hormone influences nearly every organ, an untreated overactive gland affects the heart, bones, muscles, mood, and eyes. With modern treatment, however, the disease is very manageable, and most people regain completely normal thyroid function. Causes and Risk Factors: In Graves' disease, an antibody called thyroid-stimulating immunoglobulin mimics the body's normal thyroid-stimulating hormone, driving the gland to make far too much hormone. Risk factors include:
  • Family history: Graves' disease and other thyroid conditions run in families.
  • Sex: Women are affected several times more often than men.
  • Other autoimmune diseases: Type 1 diabetes and rheumatoid arthritis increase the risk.
  • Smoking and stress: Smoking in particular raises the risk of Graves' eye disease, and quitting is a treatment in itself.
  • Pregnancy: Onset is somewhat more common in the year after delivery in susceptible women.
Symptoms: Symptoms reflect a metabolism running too fast and may include:
  • Unintentional weight loss: Despite a normal or increased appetite.
  • Rapid or irregular heartbeat: Palpitations are common, and some people develop atrial fibrillation.
  • Anxiety, irritability, and tremor: Along with difficulty sleeping.
  • Heat intolerance and sweating: Feeling overheated when others are comfortable.
  • Frequent bowel movements, muscle weakness, and an enlarged thyroid (goiter).
  • Light or missed menstrual periods: Hormone excess commonly disrupts the menstrual cycle.
  • Eye changes: In Graves' eye disease, the eyes may bulge, feel gritty, water, or see double; severe cases threaten vision and need prompt specialty care.
Diagnosis: Blood tests show a suppressed thyroid-stimulating hormone (TSH) with elevated thyroid hormone levels (T4 and T3), and measuring the stimulating antibody usually confirms Graves' disease as the cause. When the picture is unclear, a radioactive iodine uptake scan distinguishes Graves' disease from other causes of hyperthyroidism, such as thyroiditis or a hot nodule. Because anxiety, palpitations, and weight loss have many possible causes, hyperthyroidism is often discovered only when blood work is finally checked; labs are then repeated regularly during treatment to guide dosing. Treatment: Three effective options exist, and the choice depends on age, severity, eye involvement, and personal preference:
  • Antithyroid medication: Methimazole blocks hormone production and can bring about remission in some patients after one to two years of treatment.
  • Beta-blockers: Used early on to control rapid heart rate, tremor, and anxiety while other treatment takes effect.
  • Radioactive iodine: A capsule that gradually shrinks the overactive gland; most patients eventually develop hypothyroidism afterward and take thyroid hormone replacement.
  • Surgery: Removing the thyroid is preferred for very large goiters, suspicious nodules, or when other options are unsuitable.
The choice of therapy is individualized: methimazole is usually tried first, radioactive iodine is avoided when eye disease is significant, and surgery calls for an experienced thyroid surgeon. Untreated hyperthyroidism can lead to heart rhythm problems, bone loss (osteoporosis), and rarely thyroid storm — a sudden, severe surge of hormone with fever, racing heart, and confusion that is a medical emergency requiring immediate care. With treatment, the outlook is excellent. The internal-medicine team at Zimmer Medical Group diagnoses and manages Graves' disease and coordinates endocrinology and eye care when needed.

Related Medications

Commonly prescribed medications for this condition

Methimazole

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