<s>[INST] I m training for a 1/2 marathon and ran 11 miles on a flat course a week ago. The next day there was considerable pain in my lower leg. localized swelling. No redness. Area is interior about 6 inches above my ankle. I tried running again three days later and was unable to. [/INST] Hi, You may be having a stress fracture of tibia. This fracture happens due to overexertion. You were not having enough experience running and due to overrunning this has happened.  Please Avoid running for a period of six weeks from now and take rest. Pain will go away once you stop running. Take calcium and vitamin D supplements. X-ray is not helpful for diagnosis. After 6 weeks start progressive training under the guidance of physiotherapists.  Hope I have answered your query. Let me know if I can assist you further. </s>