9 Bible Verses about Demons Causing Torment

And a Canaanite woman of that district came out and pleaded, saying, "Do pity me, Lord, Son of David; my daughter is suffering horrors from a demon."

"Lord, do pity my son, for he has epilepsy and suffers excruciating pain, and often falls into the fire or into the water.

Wherever it seizes him, it convulses him, and he foams at the mouth and grinds his teeth; and he is wasting away. So I asked your disciples to drive it out, but they could not do it." He answered them, "Oh, you unbelieving people of the times! How long must I be with you! How long must I put up with you! Bring him to me." And they brought the boy to Him. As soon as the spirit saw Him, it convulsed the boy, and he fell on the ground and kept rolling over and foaming at the mouth.

all at once a spirit seizes him, and he suddenly screams, and it convulses him until he foams at the mouth, and in a struggle it bruises him and then leaves him. I begged your disciples to drive it out, but they could not." Then Jesus answered, "O you unbelieving, stubborn people of the times! How long must I be with you and put up with you? Bring him here to me."read more.
Even while the boy was coming to Him, the demon dashed him down and convulsed him, but Jesus reproved the foul spirit and cured the boy and gave back to his father.

All night and all day he kept screaming among the tombs and on the hills, and kept gashing himself with stones.

Even those who were troubled by foul spirits were being cured.

and there was a woman there who for eighteen years had had a disease caused by a spirit. She was bent double and could not straighten herself up at all.

Even from the towns around Jerusalem crowds continued coming in to bring their sick ones and those troubled with foul spirits, and they were all cured.

So the man in whom the evil spirit was, leaped upon them and so violently overpowered two of them that they ran out of the house stripped of their clothes and wounded.