HMN 2025: How Thyroid therapy might enhance intestine well being in individuals with hypothyroidism

People with an underactive thyroid might have an elevated danger of growing small intestinal bacterial overgrowth (SIBO), a danger which may be decreased with thyroid hormone therapy, in line with a review being introduced Saturday at ENDO 2025, the Endocrine Society’s annual assembly in San Francisco, Calif.

“We now know that individuals with hypothyroidism, particularly these with autoimmune thyroiditis, usually tend to develop SIBO, however this danger seems to be mitigated in these taking thyroid medicines,” stated Ruchi Mathur, M.D., Director of the Diabetes Outpatient Treatment and Education Center and Director of Clinical Operations of Medically Associated Science and Technology, at Cedars-Sinai in Los Angeles, Calif.

Mathur stated their analysis additionally suggests there could also be a microbiological mechanism driving this affiliation, which might result in extra customized remedies.

The researchers investigated the connection between SIBO and hypothyroidism in individuals older than 18 who beforehand underwent higher endoscopy with out colon prep and reported dwelling with hypothyroidism in addition to controls. Subjects had been recruited by means of their flagship REIMAGINE study.

They analyzed small bowel fluid samples from 49 individuals with hypothyroidism and 323 with out the {condition} and carried out DNA sequencing to establish microbial species. The outcomes confirmed that individuals with hypothyroidism had a considerably increased prevalence of SIBO in comparison with controls (33% vs. 15%).

Mathur and colleagues then additional evaluated 4 teams: SIBO-positive with hypothyroidism, SIBO-negative with hypothyroidism, SIBO-positive with out thyroid illness, and SIBO-negative with out thyroid illness.

The evaluation confirmed completely different patterns of micro organism within the intestine relying on an individual’s thyroid standing and co-occurrence of SIBO.

Separately, they carried out a large-scale evaluation of medical information from the TriNetX database, which regarded on the 10-year dangers of growing SIBO in individuals with hypothyroidism or autoimmune thyroiditis in comparison with matched controls. The dangers had been additionally mitigated in individuals taking levothyroxine.

“Results confirmed the chance of growing SIBO in topics with hypothyroidism is 2.2 instances greater than the chance in a matched {control} cohort and was 2.4 instances increased in these with autoimmune thyroiditis in comparison with a matched {control} group. This echoes our findings within the REIMAGINE cohort,” famous the research’s presenting writer, Margaret Wei, M.D., of the Cedars-Sinai Medical Center Endocrine Fellowship Program.

“These findings open the door to new screening and prevention methods. For instance, docs might start to observe thyroid well being extra carefully in sufferers with SIBO, and vice versa. It additionally helps the concept that bettering intestine well being might have far-reaching results past digestion, probably even serving to to stop autoimmune illnesses, corresponding to Hashimoto’s,” Mathur stated. “As analysis continues, this might result in extra customized care and earlier interventions for at-risk people.”