HealthHub Login

Irritable Bowel Syndrome and Thyroid

By Lucy Rose Clinic

March 31, 2022

IBS is extremely common in our clinic, and that is because the thyroid affects the function and healing speed of the entire gut.

What is IBS? Irritable bowel syndrome (IBS) is a disorder characterized by abdominal pain or discomfort and latered bowel habit (chronic or recurrent diarrhea, constipation, or both - either mixed or in alternation).

Whether you have too much or too little thyroid hormones, any changes in bowel frequency are a thyroid imbalance sign when other symptoms coincide:

  • Weight gain or loss
  • Fatigue
  • Depression or anxiety
  • Hair loss
  • Drier skin and hair
  • Feeling colder or hotter
  • Hair thinning on the outer 3rd of the eyebrows
  • Menstrual changes
  • Changes in libido

IBS also has an infective element, so book a call to discuss your symptoms and we can start a healing plan to address your concerns.

Access the Right Treatment for Your Hormones! With personalised testing and treatment plans!

Thyroid and IBS

The digestive system is affected by thyroid disorders and the majority of patients will have symptoms related to their digestion.

Many studies show that the thyroid has a direct impact on your gut.

Studies have shown that there is a reduction in esophageal and gastric motility in hypothyroidism. Reduced motility and low stomach acid also cause increased bacterial growth in the small intestine; a condition known as Small Intestinal Bacterial Overgrowth (SIBO).

Hashimoto’s disease is associated with reduced esophageal motility which presents as nausea, vomiting, bloating, dysphagia (difficulty swallowing), and heartburn.

Common synthetic thyroid medications may contain excipients such as lactose that cause bloating and discomfort, and these excipients are cumulative.

Did You Know?

Thyroid Hormones Are Stored In Your Gut.

After the production of T4 in the thyroid – a large portion of conversion to active hormone T3 occurs in the liver and the gut.  Interestingly we hold a high portion of T4 and T3 in essentially the lining that holds our digestives system in place- we circulate this through the liver and it is released in the bile back to the gut!

If you have even slightly LOW thyroid hormone production, the gut function slows – AKA constipation.
If you have even slightly HIGH thyroid hormone production, the gut function slows – AKA diarrhea.

At Home Thyroid Test

Check your waking temperature. A reading below the normal 36.6°C (after adding 1 degree to under the arm temperature) strongly suggests hypothyroid. A reading above 36.7°C may indicate hyperthyroidism (overactive thyroid).

If you are colder, your metabolic rate is slower. This causes water retention – swollen ankles, puffy face, puffy eyes.

Improving the thyroid function will improve the fluid retention.


If bloating is localised to the belly, the first step is to check for food intolerances. Food intolerances should be avoided for 3 months whilst healing the gut, and then reintroduced one at a time keeping a food and symptom diary. We run food intolerance tests for fast results using a sample of your blood. Your Lucy Rose practitioner will guide you on your diet and the healing phase of the plan.

If the belly bloating is flatter in the morning and builds up through the day regardless of diet, then SIBO should be ruled out with testing and treatment.

If the bloating also coincides with bad breath, foul odour, gripping pain, and general discomfort, a parasite cleanse may be what you need to get your gut environment back to a state of health, and we can guide you here as well, all our practitioners are experts at treating the gut.


IBS is an extremely common complaint, and most people live with symptoms for an average of 6 years before getting a medical diagnosis.

However, it is important to test the thyroid levels as that very well could the root cause to your gut related concerns. Even if you are on medication – it may not be working well, or it may even be causing the pain!

The next step is to book an appointment so we can run the testing you need to truly understand your thyroid’s health status. Our testing is different than the standard doctor testing – our markers will pick up the earlier changes, allowing us to guide you back to health. Have a close look at this test result. You will see 2 columns. NORMAL RANGE and OPTIMAL RANGE. If test results show out of OPTIMAL FINDINGS it highlights thyroid dysfunction, and we can treat this, which will also treat symptoms associated with any thyroid imbalances.

To access functional testing and treatment, BOOK NOW. We work with people all over the world, so regardless of where you are, book a call and we will look after you.

Menopause Ebook link

Related Content


Does PCOS end at menopause?

Polycystic ovary syndrome (PCOS) is a common endocrine disorder affecting women of reproductive age. It is characterised by hyperandrogenism, ovulatory dysfunction, and polycystic ovaries. While

Read More

Thyroid and ADHD Connection

Children’s health can be complex, influenced by the growth of the mind & body, and today’s article explores the potential link between thyroid and ADHD,

Read More