Are you going to answer the question, Lin? Do you believe convulsions are from demons, or from medical conditions?
Do you have a scriptural reference?
I need a context.
Obviously not all convulsions are caused by demons, but when Jesus and his apostles expelled demons sometimes the demon threw the person they possessed into convulsions.
Mark 9:25-27 (New King James Version)
25 When Jesus saw that the people came running together, He rebuked the unclean spirit, saying to it,