https://www.earth.com/news/neanderthal-skull-traits-cause-modern-brain-conditions/
''' A pulsing headache can feel like your brain is fighting for space. New research suggests that this tug-of-war may trace back to Neanderthal skull traits we share with our extinct cousins...
A recent study zeroes in on Chiari malformation type 1, a condition in which the lower cerebellum droops through the foramen magnum, the bony opening at the skull’s base. '''
Tl;dr - we have such big brains. It causes problems about our hybridized traits from The Neandarthals