People Who’ve Woken Up From A Coma Have Shared Terrifying Insights Into What It’s Really Like

And it seems that brain bleeds can be just as problematic. “Bleeding in the layers of the brain may cause [a] coma due to swelling and compression on the injured side of the brain,” the WebMD page continues. “This compression causes the brain to shift, causing damage to the brainstem and the RAS.”