Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Made neck pain worse

I purchased this pillow because I'd been having severe neck pain and couldn't move my head without shooting pain going from my neck into my head. I used the pillow for two nights and the neck pain worsened. I followed the directions on how to use the pillow, so I'm not sure what went wrong for me. It seems as though this pillow helped a lot of people with neck pain. Maybe it just doesn't work on some people or with certain types of beds. Anyway, I went back to a normal pillow and my neck pain slowly went away over the next week.