6 Bible Verses about Demons Causing Illness

One of the crowd answered, "Master, I brought my son to you, for he is possessed by a dumb spirit, and wherever it seizes him it convulses him, and he foams at the mouth and grinds his teeth; and he is wasting away. I told your disciples to drive it out, and they could not do it." He answered them and said, "O you unbelieving people, how long must I be with you? How long must I put up with you? Bring him here to me!"read more.
And they brought the boy to him. As soon as the spirit saw him, it convulsed the boy, and he fell down on the ground and rolled about, foaming at the mouth. Jesus asked the boy's father, "How long has he been like this?" And he said, "From his childhood, and many a time it has thrown him into the fire or into the water, to put an end to him. But if there is anything you can do, take pity on us and help us!" Jesus said to him, " 'If there is anything I can do!' Everything is possible for one who has faith!" The boy's father immediately cried out, "I have faith! Help my want of faith!" Then Jesus, seeing that a crowd was rapidly gathering, reproved the foul spirit and said to it, "You deaf and dumb spirit, get out of him, I charge you, and never enter him again!" And it gave a cry and convulsed him terribly, and went out of him. And the boy was like a corpse, so that most of them said that he was dead. But Jesus grasped his hand and made him rise, and he stood up.

When they came to the people again, a man came up to him and fell on his knees, saying, "Master, take pity on my son, for he has epilepsy, and is very wretched; he often falls into the fire or into the water. And I brought him to your disciples and they have not been able to cure him."read more.
Jesus answered, "O you unbelieving, obstinate people! How long must I be with you? How long must I put up with you? Bring him here to me!" And Jesus reproved the demon and it came out of him, and from that moment the boy was cured.

The next day, when they had come down from the mountain, it happened that a great crowd met him. And a man in the crowd shouted, "Master, I beg you to look at my son, for he is my only child, and all at once a spirit seizes him, and he suddenly cries out, and it convulses him until he foams at the mouth, and it leaves him, after a struggle, badly bruised.read more.
And I begged your disciples to drive it out, and they could not." Jesus answered, "O you unbelieving, obstinate people! How long must I be with you and put up with you? Bring your son here!" Even while the boy was coming, the demon threw him down and convulsed him, but Jesus reproved the foul spirit and cured the boy and gave him back to his father.

But just as they were going out, some people brought to him a dumb man who was possessed by a demon, and as soon as the demon was driven out, the dumb man was able to speak. And the crowds were amazed, and said, "Nothing like this was ever seen in Israel!"

Once he was driving out a dumb demon, and when the demon was gone the dumb man spoke. And the people were amazed.

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