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Scientists find big cause of lingering Crohn’s disease symptoms
Many people with Crohn’s disease continue to have symptoms even when inflammation is absent. This study suggests the gut microbiome — specifically sulfur-producing bacteria and hydrogen sulfide production — might explain those lingering symptoms and point to new treatment approaches such as dietary changes.
Adults with Crohn’s disease who have persistent symptoms despite remission, clinicians treating IBD, and researchers studying the gut microbiome and symptom mechanisms.
What To Know
Researchers at the University of Michigan reported that patients with quiescent (non-inflamed) Crohn’s disease who still have symptoms show enrichment of sulfur-producing (sulfidogenic) gut bacteria and increased sulfur metabolic activity in stool samples.
The team links microbial production of hydrogen sulfide to weakened intestinal barrier function and increased visceral hypersensitivity, which could explain lingering symptoms despite absence of detectable inflammation.
The study compared stool samples from patients with persistent symptoms to those in remission without symptoms and found higher levels of sulfur-metabolizing microbes and related pathways in the symptomatic group.
The researchers are exploring a low-sulfur diet in a pilot study to see if reducing available sulfur to gut microbes lowers hydrogen sulfide production and symptom burden.
This article summarizes a published study in Inflammatory Bowel Diseases and highlights the microbiome and microbial metabolites (hydrogen sulfide) as a potential non-inflammatory driver of symptoms in quiescent Crohn’s disease. It does not provide treatment recommendations or detailed study data.
If you want to read more, look up the original paper in Inflammatory Bowel Diseases for methods, sample size, and statistical details.
This is an early clinical study comparing stool microbiomes and metabolic activity; it suggests an association rather than proving causation. The researchers have started a small pilot dietary trial (low-sulfur diet), but larger, controlled studies are needed before changing clinical care.
The original paper in Inflammatory Bowel Diseases should be consulted for full study details and limitations.
