According to the results of differentially expressed gene analysis and KEGG pathway and GO term enrichment analyses, the TNF signalling pathway, IL-17 signalling pathway, and MAPK signalling pathway were significantly enriched in the eutopic endometria of women with endometriosis, which indicated a proinflammatory immune status in the eutopic endometria of women with endometriosis. Here, IL17A is linked to endometriosis.