I remember reading about a case where an immigrant woman from africa went to the hospital somewhere in the US, with complaints about pain and partial paralysis "due to a curse". Doctors examined her and she was dismissed from the hospital after concluding that she was fine. She came back and this was repeated 3-4 times. First they thought she was trying some sort of insurance scam (i think she was homeless), but finally decided to call a "priest" with knowledge about her religion who performed something like an exorcism on her. She was fine after that.