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A Silent Problem—Is It Yeast?

A Silent Problem—Is It Yeast?
Updated: May 10, 2025

Problems from Intestinal Yeast Overgrowth in Lyme

Too many yeast in the intestines lead to a number of problems in Lyme disease. Here are a few.

  • Increased cytokine (Lyme) symptoms. Yeast overgrowth leads to inflammatory cytokine excess. Just like white blood cells responding to Lyme make too many cytokines, white blood cells make too many cytokines responding to yeast too. Excess cytokine symptoms give most of the Lyme disease symptoms. This means that too many yeast in a person’s intestines can make it look like Lyme is worse. But the problem could be yeast triggering more cytokines. Read more about cytokines in Control Cytokines: A Guide to Improve Lyme Symptoms & Immune Health.
  • Food allergies. Food allergies and sensitivities can be the result of yeast overgrowth too. Too many yeast is one of the major causes of leaky gut syndrome leading to food allergies. For more information see Your Guide to a Healthy Intestinal Microbiome—Even on Antibiotics.
  • Immune suppression. Excess cytokines and allergies to yeast may lead to immune suppression.

Marty Ross MD Discusses Yeast Problems and Diagnosis

  • Diagnosing Yeast. For more information about diagnosing intestinal yeast, read the whole article below this video.
  • Yeast Care Regimens. For information on how to address yeast see Kills & Prevents Yeast: A Brief Guide.

How to Diagnose Yeast Overgrowth of the Intestines in a Lyme Disease Regimen

At the Beginning of Care

There is not a useful diagnostic blood test or stool test for yeast overgrowth. While some may test for antibodies in the blood to intestinal yeast. Yeast antibodies are common even when yeast are in balance. In addition, it is normal to have stool cultures grow yeast; so a culture does not indicate if yeast are in excess. For this reason, yeast are diagnosed using a yeast screening questionnaire. This questionnaire evaluates for the possibility of yeast overgrowth based on yeast overgrowth risk factors and intensity of symptoms. In general, based on my experience, people benefit from a yeast care regimen if the score is 140 or higher.

Often before antibiotics are started in a Lyme disease is essential to address yeast. Doing so can limit the severity of Herxheimer die­-off reactions from a Lyme care regimen. This is because removing yeast removes one source of inflammatory cytokine excess.

In the Middle of a Care Regimen

Note:  If a person has a sudden decline after doing better, there is a good chance yeast is the cause. The excess cytokines triggered by yeast give most of the same symptoms that occur in Lyme disease. So yeast can imitate a Lyme decline.

The yeast screening questionnaire is not reliable in the middle of a tick-borne diseases care regimen. I make a decision to address yeast in this situation based on symptoms.

Symptoms of yeast in the middle include:

  • sugar carvings,
  • increased brain fog,
  • doing worse after having sugar,
  • increased intestinal gassiness or bloating,
  • vaginal itching or discharge,
  • rectal itching,
  • worsened skin rashes or acne,
  • difficulty swallowing, and/or
  • white patches in the mouth.

You do not have to have all of these symptoms to diagnose too many yeast. If a person has a number of these with a decline, then there is a strong possibility of intestine yeast overgrowth.

Disclaimer

The ideas and recommendations on this website and in this article are for informational purposes only. For more information about this, see the sitewide Terms & Conditions.

References

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About The Author

Marty Ross, MD is a passionate Lyme disease educator and clinical expert. He helps Lyme sufferers and their physicians see what really works based on his review of the science and extensive real-world experience. Dr. Ross is licensed to practice medicine in Washington State (License: MD00033296) where he has treated thousands of Lyme disease patients in his Seattle practice.

Marty Ross, MD is a graduate of Indiana University School of Medicine and Georgetown University Family Medicine Residency. He is a member of the International Lyme and Associated Disease Society (ILADS), The Institute for Functional Medicine, and The American Academy of Anti-Aging Medicine (A4M).

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