Managing Diarrhea After Hyperthyroidism Diagnosis and Treatment - Breast and Thyroid

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Hyperthyroidism has been causing persistent diarrhea?


A while ago (around mid-October), I received the second dose of the Moderna vaccine.
About 2-3 weeks later, I started experiencing throat discomfort, followed by hand tremors, palpitations, rapid heartbeat, shortness of breath, and increased heat sensitivity.
After seeking medical attention, I was diagnosed with hyperthyroidism and began taking medication for it (I am scheduled for a follow-up appointment in mid-December).
After taking the medication for about 10 days, I suddenly started having diarrhea, going to the bathroom more than 20 times in one day, which led to hospitalization for stool tests and antibiotic treatment.
The results showed no bacterial infection, and I was discharged, but I am still experiencing diarrhea (though it is not as severe).
I would like to know if this is a symptom of hyperthyroidism or a side effect of the medication.
How can I alleviate the frequency of diarrhea (currently about 3-5 times a day)? Could this also be a side effect of the vaccine? I appreciate your help in clarifying my concerns.
Thank you.

Huang Ba, 60~69 year old female. Ask Date: 2021/11/27

Dr. Yuan Tianmin reply Breast and Thyroid


Many conditions can cause diarrhea, including vaccines, thyroid issues, and gastroenteritis, so it's difficult to definitively identify the cause.

Reply Date: 2021/11/27

More Info


Managing diarrhea after a diagnosis and treatment of hyperthyroidism can be complex, as multiple factors may contribute to gastrointestinal symptoms. In your case, it is essential to consider the interplay between hyperthyroidism, the medications you are taking, and any potential post-vaccination effects.

Hyperthyroidism, characterized by an overactive thyroid gland, can lead to various symptoms, including increased metabolism, anxiety, tremors, and gastrointestinal disturbances such as diarrhea. The elevated levels of thyroid hormones can speed up the digestive process, leading to more frequent bowel movements. In your situation, the onset of diarrhea after starting medication for hyperthyroidism could be due to the condition itself or a side effect of the medication.

The medications used to treat hyperthyroidism, such as methimazole or propylthiouracil, can also have gastrointestinal side effects, including nausea, vomiting, and diarrhea. If you have recently started a new medication, it is crucial to monitor your symptoms closely. If diarrhea persists or worsens, it may be necessary to consult your healthcare provider to evaluate whether the medication needs adjustment or if an alternative treatment should be considered.

Additionally, the timing of your symptoms following the Moderna vaccine raises the question of whether there could be a connection. While vaccines can cause temporary immune responses, including mild gastrointestinal symptoms, it is less common for them to cause prolonged diarrhea. However, if you experienced gastrointestinal symptoms shortly after vaccination, it is worth discussing with your healthcare provider to rule out any vaccine-related issues.

To manage your diarrhea effectively, consider the following strategies:
1. Dietary Adjustments: Focus on a bland diet that is easy on the stomach. Foods such as bananas, rice, applesauce, and toast (the BRAT diet) can help firm up stools. Avoid high-fiber foods, dairy products, and greasy or spicy foods, which may exacerbate diarrhea.

2. Hydration: Diarrhea can lead to dehydration, so it is crucial to drink plenty of fluids. Oral rehydration solutions can help replenish lost electrolytes. Aim to drink water, clear broths, or electrolyte solutions.

3. Probiotics: Consider incorporating probiotics into your diet, either through supplements or fermented foods like yogurt or kefir. Probiotics can help restore the balance of gut bacteria and may alleviate diarrhea.

4. Monitor Symptoms: Keep a diary of your bowel movements, dietary intake, and any other symptoms. This information can be valuable for your healthcare provider in determining the cause of your diarrhea and adjusting your treatment plan accordingly.

5. Follow-Up with Your Doctor: Since you have an upcoming appointment in December, it would be beneficial to discuss your ongoing symptoms with your healthcare provider. They may recommend further testing or adjustments to your treatment plan based on your current condition.

In summary, diarrhea after a diagnosis and treatment of hyperthyroidism can stem from the condition itself, the medications used, or other factors such as recent vaccinations. By making dietary adjustments, staying hydrated, and monitoring your symptoms, you can manage your diarrhea more effectively. Always consult your healthcare provider for personalized advice and treatment options tailored to your specific situation.

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