ADGRA2 and intracerebral hemorrhage: Lithium significantly decreases hematoma volume and improved neurological outcomes of mice following intracerebral hemorrhage (ICH), and increases blood–brain barrier (BBB) integrity evidenced by reduction of brain edema, Evans blue leakage, and blood IgG extravasation via the Gpr124‐mediated endothelial Wnt/β‐catenin signaling.