According to previous GSEA and immune cell infiltration analysis results, the immune system plays a vital role in the pathogenesis of ICH; subsequently, we identified 18 intersecting genes by overlapping 2029 key module genes related to ICH, 721 key genes related to the immune system and 367 DEGs (ICH vs. HTN and ICH vs. CTRL); these genes were identified as immune-related DEGs in ICH (Figure 4C). Here, CTRL is linked to hypertensive disorder.