I am posting this hoping that it helps someone with a similar problem. I began having hip pain on week 3 in only one side, my right. By day 3, week 3 it was too painful to continue. I was very disappointed with the setback. I did some reading online. I know, not all information found there is accurate but I read something that made sense. It could be that I am not balanced and my hip muscles are not strong enough to support my joint during the repeated impact as I increase my running time. Even after a two week break the pain returned as soon as I tried to jog again. I started going to the gym 3 to 4 times a week working out on the elliptical machines to strengthen my muscles without impact. After 6 weeks of that I am feeling much stronger overall and was able to start jogging again. My hip is still a little "twingy sometimes". It may be something I always have to be mindful of but building strength in my entire body has helped that hip quite a bit. I have resumed the C25k program on week 4, day 1 and did so with no problems. I may make my goal of a September 5K after all.