I'm 16 and I have been Irish dancing for almost a year. To improve my stamina for dancing, I have been walking 1.5 miles and running 1 mile in the morning and evening. I cut the morning run on days that I have dance class, which is twice a week.

In early July I went to a family reunion and had to perform on a very hard wood floor (I usually dance on a sprung wooden dance floor.)Since then I have had muscle pain only on the inside of my lower leg. The pain is sharper than normal muscle soreness. It is worse in my left leg (my weaker leg), though it is present in my right as well. I have not been able to run since mid July, and I haven't been walking very often. I can usually dance with little or no pain, especially during class, but last week I was teaching some friends some steps and it became quite painful.

Do you have any suggestions as to what this might be, why it doesn't seem to be going away, or what I can do help it?