Dysgonomonas (associated with the presence of TCFA) had a significant positive correlation with IL‐6, Paraprevotella (associated with the presence of TCFA, decrease in FCT, and increase in PAV) had a significant positive correlation with fibrinogen and negative correlation with HDL‐C, Succinatimonas (associated with a decrease in FCT and increase in PAV) had significant positive correlations with fibrinogen and homocysteine, and Bacillus (associated with a decrease in FCT and increase in TAVnormalized) had significant positive correlations with fibrinogen and hs‐CRP. Anaerostipes (associated with an increase in FCT and decrease in lipid index, PAV, and TAVnormalized) had significant negative correlations with TMAO, TNFα, and IL‐6, and Dielma (associated with an increase in FCT) had negative correlations with white blood cells, TMAO, PAI‐1, and homocysteine and a positive correlation with HDL‐C. FCT indicates fibrous cap thickness; HDL‐C, high‐density lipoprotein cholesterol; hs‐CRP, high‐sensitivity C‐reactive protein; IL, interleukin; PAI‐1, plasminogen activator inhibitor‐1; PAV, percent atheroma volume; TAVnormalized, normalized total atheroma volume; TCFA, thin‐cap fibroatheroma; TMAO, trimethylamine N‐oxide; TNFα, tumor necrosis factor α; and WBC, white blood cell.