H. pylori and Hashimoto's: What the Research Shows, and the Tests to Ask For

Your thyroid antibodies come back high. Your TSH comes back "technically normal." You hear that there is nothing to treat yet, and you go home with the same fatigue, the same cold hands and feet, and the same brain fog you came in with.

If that sounds familiar, you are in large company. Hashimoto's thyroiditis is the most common cause of an underactive thyroid in the United States, and it can build sleepily for years before a routine blood test flags it. On a recent episode of the Ancient Health Podcast, I made a case that many Hashimoto's patients are missing a piece of the picture, and that the piece sits in the stomach.

What Hashimoto's actually is

Hashimoto's is an autoimmune disease. Your immune system slowly attacks your own thyroid gland. Cytotoxic T cells get into the gland and destroy thyroid tissue directly, while other immune cells push B cells to make antibodies against two of your thyroid's working parts.

The first is thyroid peroxidase (TPO), the enzyme that attaches iodine to thyroglobulin and couples the pieces into the thyroid hormones T4 and T3. The second is thyroglobulin (Tg), the large protein the hormones are built on and stored in. According to StatPearls, more than 90 percent of people with Hashimoto's carry TPO antibodies, and 50 to 80 percent carry thyroglobulin antibodies. Women are affected at least seven to ten times as often as men, and most cases appear between ages 45 and 55.

Here is the practical problem. Most standard panels check TSH only. Antibodies can climb for years before the gland loses enough capacity to push TSH out of range. So a person can have an active autoimmune process and a "normal" lab report at the same time.

Meet H. pylori, the infection you may have forgotten

Helicobacter pylori is a spiral bacterium that lives in the stomach lining. It survives stomach acid by using an enzyme called urease, which splits urea from the bloodstream into ammonia and wraps the bacterium in an acid-neutralizing cloud. That same chemistry is how the urea breath test detects it.

A new infection can cause a few days of nausea, a tight stomach, and no appetite. Then the symptoms fade, and most people forget about it. The infection often does not fade. It can persist for decades, and many long-term carriers notice only subtle signs.

In many long-term infections, the stomach's acid-producing glands are gradually damaged and acid output falls. That is not universal. Roughly one in ten infected people, usually those whose infection sits in the lower stomach, produce more acid instead.

How people actually catch it

H. pylori spreads mainly from person to person, most often in childhood and within families. In a household study published in Emerging Infectious Diseases in 2006, living with an infected person who had a stomach illness raised the risk of a new infection about fivefold, and exposure to vomiting raised the odds about sixfold. New infections were far more common in toddlers than in adults.

His own patient story makes the point. When he asked the patient whether either parent had H. pylori, the answer was yes: "my mom had H. pylori severely."

Is H. pylori really linked to Hashimoto's?

In pooled data, yes. A 2017 meta-analysis of 15 studies and 3,046 people (Hou and colleagues, Oncotarget) found H. pylori infection linked to about twice the odds of Hashimoto's (odds ratio 2.16) and somewhat higher odds of Graves' disease (2.78). The more aggressive CagA-positive strains carried a similar signal.

The studies do not all agree. An Italian study of 112 newly diagnosed patients (Bassi and colleagues, 2012) found active infection strongly tied to Graves' disease but not to Hashimoto's. A 2024 genetic study in Science Advances also found its clearest causal signal on the Graves' side.

How could a stomach bacterium influence the thyroid? Dr. Motley described molecular mimicry: the immune system learns to attack an H. pylori protein, and some thyroid proteins look similar enough to get caught in the crossfire.

Researchers have found stretches of shared structure between H. pylori antigens and thyroid proteins by sequence comparison (Figura and colleagues, 2019), and higher inflammation and antibody levels with CagA-positive strains. That makes mimicry a reasonable hypothesis. It has not been shown to cause Hashimoto's in people. Chronic, low-grade inflammation from a long-running infection is a second possible pathway.

The study at the center of the episode was published this year in The Egyptian Journal of Internal Medicine (Mwafy, Laqqan and Yassin). Researchers enrolled 50 hypothyroid women, aged 20 to 52, who had H. pylori and whose TSH would not come down even on high doses of levothyroxine. They compared them with 50 healthy women of the same age, then treated the H. pylori with a 14-day course of omeprazole, amoxicillin, and clarithromycin.

TSH fell from an average of 11.87 to 8.44 at two months, then 2.56 at four months, inside the normal range. That is a striking change in a group chosen because their numbers would not move.

The antibodies told a more nuanced story. Thyroglobulin antibodies fell from 63.24 to 53.94, still about three times the control group's average. TPO antibodies did not change significantly. On the podcast, Dr. Motley described the antibodies falling "as though it was a totally different disease." The published data do not show that, and we want you to have the real numbers.

So why did TSH fall so far if the autoimmune attack barely changed? The likeliest answer is absorption. Levothyroxine needs stomach acid to dissolve and absorb well, and H. pylori gastritis lowers acid. In a 2006 New England Journal of Medicine study of 248 patients, those with H. pylori gastritis, atrophic gastritis, or both needed 22 to 34 percent more thyroxine to hit their TSH target. Women selected for not responding to high doses are exactly the group you would expect to have an absorption problem. Clear the infection, acid recovers, more of the pill gets in, and TSH comes down.

That is a gut-thyroid connection, and it is useful. If your TSH will not settle on a dose that should be working, ask your prescriber whether H. pylori or low stomach acid could be affecting absorption.

One more note. The antibiotic combination used in the Egyptian study is no longer first-line in the United States. The American College of Gastroenterology's 2024 guideline recommends against starting with clarithromycin-based triple therapy because resistance has climbed, and lists 14-day bismuth quadruple therapy first, followed by a test of cure at least four weeks after treatment.

One patient's story

I shared the case of a patient of mine who had lived with anxiety since age five and arrived with a manila folder of labs "about 6, 7 inches thick." H. pylori had shown up across ten years of those labs. Other practitioners had focused on Epstein-Barr virus. Over about fifteen months of care, including herbal treatment aimed at H. pylori, his anxiety eased, his stomach tightness faded, his hands and feet warmed, and his TPO antibodies fell. A later stool test showed H. pylori near zero.

I want to be careful about what the story does and does not prove. It is one patient, treated for several things over more than a year. It also carries a lesson about testing: if those ten
years of results were blood antibody tests, they could not tell a current infection from an old one. H. pylori blood antibodies stay positive in about 72 percent of people three and a half years after successful treatment. The tests for active infection are the urea breath test and the stool antigen test.

What Chinese medicine noticed

In Traditional Chinese Medicine, the picture many Hashimoto's patients describe maps onto a pattern called Spleen and Kidney Yang deficiency. The Kidneys supply what TCM calls metabolic fire. The Spleen governs transformation and transportation, turning food into usable energy.

When both run cold, the classical signs are bone-deep cold, fatigue that rest does not fix, swelling, loose stools, and a slow pulse. A classical formula for this pattern, Fu Zi Li Zhong Tang, is attributed to a Song dynasty text from 1174. The name Hashimoto's did not exist then. What stands out is that the framework put digestion at the center of a cold, exhausted, underpowered body centuries before anyone measured a stomach infection affecting thyroid numbers.

(The formula includes prepared aconite, which is toxic if processed or dosed wrong. It is prescribed by licensed practitioners, not taken on your own.)

What about herbs?

Dr. Motley uses Coptis (goldthread), Scutellaria (Chinese skullcap), and reishi in his practice. The evidence varies:

Coptis. Its main alkaloid, berberine, raised H. pylori cure rates when added to antibiotic treatment across 13 Chinese trials with 2,111 patients. No trial shows Coptis alone clears the infection.

Scutellaria and reishi. Laboratory data only so far.

Uva ursi came up on the show as a kidney builder. European regulators limit it to one week for mild urinary symptoms in women and list kidney disorders as a reason not to use it.

If you have H. pylori, talk with your clinician about guideline treatment, and about whether any herb belongs alongside it.

Before your next thyroid appointment

Here is the list to bring.

"Can we check my TPO and thyroglobulin antibodies, not just TSH?"

"Can I be tested for active H. pylori with a breath or stool test?" Ask which medicines to pause first so the result is accurate.

"If it's positive, which treatment, and when do we retest?" Guideline first-line in the US is 14-day bismuth quadruple therapy, with a test of cure at least four weeks later.

"My TSH won't settle. Could absorption be the problem?"

"Should I be screened for celiac disease?" People with celiac disease have three to four times the odds of autoimmune thyroid disease.

Listen to the full episode on how TPO builds thyroid hormone, why H. pylori is so hard to shake, and the full patient story in YOUTUBE LINK APPLE LINK SPOTIFY LINK 

Educational only, not medical advice. Do not stop, start, or change any medication without your prescriber!