After years of doing nothing, and looking at these threads, i decided to try running. I took it easy, and after 5 weeks, I managed to run 3k without stopping, I was so proud, but 2runs after, my knee was very painful. The pain is on the inside of my right knee to the left of the knee cap. It feels tender to touch and is most sore going down stairs and thobs a little. I am gutted as have not been able to run for the last 5 days. Is this serious? Has anyone any ideas as to how to treat it? I never thought I would say this but I really miss the exercise. Thanks.