Neurological problems are occurring in a very high percentage of hospitalized COVID-19 patients — and what's worse, those symptoms foretell a bad end for many sufferers, a new study finds. About four out of five people sick enough to be hospitalized for COVID-19 suffer some sort of neurological problem, ranging from headache and a loss of sense of smell to confusion, delirium, stroke and coma, researchers report. Even worse, COVID-19 patients who have diagnosed neurological symptoms associated with their infection are six times more likely to never leave the hospital.