Graves’ disease is treated with one of three main approaches: antithyroid medication, radioactive iodine therapy, or surgery to remove the thyroid gland. The right choice depends on your age, whether you’re pregnant or planning to be, the severity of your symptoms, and whether the disease has affected your eyes. Each option has a different timeline, different trade-offs, and a different long-term outlook.
Antithyroid Medications
Antithyroid drugs work by blocking your thyroid’s ability to produce excess hormones. They’re often the first treatment offered, especially outside the United States, and they’re the only option that gives your immune system a chance to calm down on its own without permanently altering your thyroid.
The standard course lasts 12 to 18 months. During that time, your doctor will start you at a higher dose and gradually reduce it as your hormone levels normalize. Maintenance doses are significantly lower than starting doses. Most people notice symptoms improving within a few weeks, though it can take longer for levels to fully stabilize. Blood tests every few weeks in the early months help guide dose adjustments.
The major limitation is the remission rate. Only about 25 to 50 percent of patients stay in remission after completing a course of antithyroid medication. The rest relapse and need either a second round or a more permanent treatment. Still, for people with mild disease, small thyroid glands, or eye involvement, medication is often preferred because it avoids the antibody spike that radioactive iodine can trigger.
The most important side effect to know about is a rare but serious drop in white blood cells, which weakens your ability to fight infections. If you develop a fever, sore throat, or mouth sores while taking the medication, contact your doctor immediately for a blood count check. Other side effects like rash, joint pain, or stomach upset are more common but usually manageable.
Radioactive Iodine Therapy
Radioactive iodine (RAI) is the most commonly used definitive treatment in the United States. You swallow a single capsule or liquid dose of radioactive iodine, which is absorbed almost exclusively by your thyroid gland. Over the following weeks to months, the radiation gradually shrinks and disables the overactive tissue.
A study of 138 patients found a cure rate of 87.7% with a single dose. The small number who don’t respond fully may need a second dose. Before the procedure, you’ll follow a low-iodine eating plan for one to two weeks, which means avoiding iodized salt, dairy, seafood, and certain processed foods. Your doctor will provide a specific list.
The trade-off is straightforward: RAI almost always results in an underactive thyroid (hypothyroidism), which means you’ll take thyroid hormone replacement pills for the rest of your life. For most people, this is a simple daily pill with minimal side effects, and it’s considered a fair exchange for reliably eliminating hyperthyroidism.
One important consideration is eye disease. Worsening of Graves’ eye disease is more common in patients who choose RAI compared to those treated with medication. RAI triggers a temporary spike in the immune antibodies that attack tissue behind the eyes, and this effect is especially pronounced in smokers. If you have moderate or severe eye involvement, your doctor will likely steer you toward medication or surgery instead.
RAI is not an option if you’re pregnant, breastfeeding, or have young children at home, because the radiation can affect others in close contact during the first few days after treatment.
Thyroid Surgery
Total thyroidectomy, the complete removal of the thyroid gland, is the fastest way to resolve Graves’ disease. It’s typically recommended when other treatments aren’t suitable or haven’t worked. Specific situations where surgery is preferred include:
- Severe eye disease, since surgery avoids the antibody spike caused by RAI
- Pregnancy or breastfeeding, when RAI is off the table
- A suspicious thyroid nodule or confirmed thyroid cancer alongside Graves’ disease
- A very large thyroid causing difficulty swallowing, breathing, or visible neck swelling
- Side effects from antithyroid drugs that prevent their continued use
- Hyperthyroidism that’s been difficult to control with medication
The main surgical risks involve structures near the thyroid. The recurrent laryngeal nerve, which controls your vocal cords, can be temporarily irritated during surgery, leading to hoarseness or changes in voice pitch and projection. Permanent nerve injury is very rare. The parathyroid glands, which regulate calcium levels, sit right behind the thyroid and can be temporarily disrupted, causing low calcium levels after surgery. In the hands of an experienced thyroid surgeon, permanent damage to these glands is exceedingly rare.
Like RAI, surgery results in permanent hypothyroidism, so you’ll need daily thyroid hormone replacement afterward. Recovery from the surgery itself typically takes one to two weeks before returning to normal activities.
Treating Graves’ Eye Disease
About 30 to 50 percent of people with Graves’ disease develop some degree of eye involvement, ranging from mild dryness and irritation to significant bulging, double vision, or pain. Controlling thyroid hormone levels is the first step, but the eye disease runs on its own timeline and sometimes needs separate treatment.
For mild eye symptoms, lubricating eye drops, sunglasses, and sleeping with your head elevated can help. Selenium supplementation at doses ranging from 100 to 200 micrograms per day has shown benefit in mild cases. Research has found that six months of selenium supplementation can improve quality of life, reduce eye involvement, and slow disease progression in mild-to-moderate eye disease, though it doesn’t appear to change long-term outcomes.
For moderate to severe eye disease, a newer injectable treatment targets the specific receptor involved in the swelling behind the eyes. In clinical trials, about 62% of patients treated with this therapy had a meaningful reduction in eye bulging, compared to 25% of those receiving a placebo. The average reduction in bulging was roughly 2.4 millimeters. The most common side effects include muscle spasms (affecting about 4 in 10 patients), fatigue, headache, and dry skin. Hearing changes occurred in about 22% of treated patients, which is an important consideration to discuss with your doctor before starting.
If you smoke, quitting is one of the most impactful things you can do for your eyes. Smoking significantly worsens Graves’ eye disease and reduces the effectiveness of treatment.
Treatment During Pregnancy
Pregnancy requires careful medication management. The preferred antithyroid drug during the first trimester is PTU (propylthiouracil), because the alternative carries a small risk of certain birth defects during early fetal development. At 13 to 14 weeks, current guidelines recommend switching to the other antithyroid medication for the remainder of the pregnancy, since PTU carries its own liver-related risks with longer use.
Radioactive iodine is completely off limits during pregnancy and breastfeeding. Surgery can be performed during pregnancy if necessary, ideally during the second trimester when the risks to both mother and baby are lowest.
Choosing the Right Treatment
There’s no single best treatment for everyone. The decision comes down to a few practical questions: How quickly do you need your hyperthyroidism resolved? Do you have eye disease? Are you pregnant or planning to become pregnant? Are you comfortable taking medication for 12 to 18 months with a coin-flip chance of remission, or would you prefer a one-time procedure that permanently solves the problem?
Younger patients with mild disease and small thyroid glands often start with medication, since they have the best odds of remission. People with significant eye disease tend to do better with medication or surgery rather than RAI. Those who want the issue resolved quickly and definitively often lean toward RAI or surgery, accepting lifelong thyroid hormone replacement as a reasonable trade-off. Your endocrinologist can help weigh these factors against your specific situation and preferences.