Background Ulcerative colitis is classified as a chronic type of inflammatory bowel disease that attacks the colon, frequently accompanied by diarrhea, abdominal pain, rectal bleeding, or both. The contribution of the gut microbiota to its pathogenesis is understood, but the exact influence of metabolites produced by bacteria on mucosa inflammation is still insufficiently investigated. To determine the level of expression of metabolites generated by gut flora and their relation to mucosal inflammation in patients suffering from ulcerative colitis. Methods This cross-sectional analytical study was done at Hayatabad Medical Complex, Peshawar, from January 2023 to January 2024. A total of 110 patients with confirmed ulcerative colitis were enrolled. Clinical data collection included measuring disease activity using the Mayo score, CRP, andfecal calprotectin. Stool and biopsy samples were analyzed for short chain fatty acids, LPS, TMAO, and tryptophan derivatives. Histological grading and cytokine expression levels were also measured. Statistical methods evaluated metabolite levels and inflammation markers. Results Patients exhibiting high inflammatory scores showed markedly lower concentrations of anti-inflammatory metabolites such as butyrate, propionate, and indole-3-propionic acid. In contrast, LPS and TMAO were elevated and strongly correlated with increased endoscopic and histological inflammation. Increased TNF-α, IL-1β, and IL-6 concentrations were also reported in patients with high concentrations of pro-inflammatory metabolites. A distinct relationship was noted between the imbalance of microbial metabolites and the degree of inflammation present in the mucosal tissue. Conclusion The investigation elucidates a clear association between the disturbance of gut microbial metabolism and the mucosal inflammation associated with ulcerative colitis. The results underlined the importance of controlling microbial metabolites as markers (therapeutic targets) in the treatment and in the monitoring of the disease activity.