Although studies have found that triggering receptor expressed on myeloid cells 1 (TREM1) is an inflammatory amplifier that plays a key role in neuroinflammatory‐related diseases, such as ischemic stroke and subarachnoid hemorrhage (SAH),9, 10 TREM1 has not been studied in the context of microglia‐mediated SIN. The gene discussed is TREM1; the disease is subarachnoid hemorrhage.