The long-term outlook for Guillain-Barré syndrome is generally good. Most patients recover fully, although it can take months or years to regain pre-illness strength and movement. About 30% of patients still have some weakness three years after the illness strikes. About 3% of patients have weakness and tingling return years later. About 3% to 5% die, almost always because they develop paralysis of the chest muscles before they have reached a hospital.