When looking for a chiropractor, ask if they believe that adjustments can help prevent colds, the flu, etc. - if so, skip them. However, despite what a few ignorant people are saying in this thread, there is plenty of evidence that chiropractors are effective for various types of pain.
I've been to one chiropractor - once it was 5 or 6 visits before I was good to go. I felt relief almost immediately. My problem was chronic upper back/neck pain that resulted in a headache, like a tension headache. M.D. doctor: "take advil. Take tylenol, more exercise, you must be stressed and that's causing the tension headaches." That's the extent that "regular medicine" was doing to help me. On the advice of a few people, I went to a chiropractor who was highly recommended. He examined me for a while, and then declared a symptom that I hadn't even mentioned to him - I thought I had the beginnings of carpal tunnel syndrome starting & didn't think it was related at all. Some sort of compression in one of my vertebra was causing it - muscle stuff, etc. The chiro asked, "you're having a lot of tingling in your right fingers, aren't you?" The occasional tingling in my fingers went away after the adjustments. The headaches went away. We were buying Advils in 500 packs directly from the hospital - I was taking them multiple times a day, at least 5 days a week for the headaches. Each time I was "adjusted", the benefits lasted a little longer than the previous time. After maybe a half dozen visits, the problems were gone.
Years later, I started having trouble again. I only needed one visit & the problem was taken care of.