I think Stress
I think stress can trigger alot of factors with many diseases. Someone with lupus under large amounts of stress can trigger a lupus flare. I guess this would be the same for GBS. Stress causing residuals making the nerve damage act up and causing problems. And then there are the rare cases that don’t happen much but have happened where a person got GBS a second time. But what triggered that second attack might not even be to stress. But stress can cause many problems in other diseases as well, including heart disease.