It contracts when you toe off and, if you are a mid-foot or toe striker, when you land with each stride. The peroneal muscle helps stabilize the ankle while running and walking. If the pain is just above that location, you may have “subluxed” or “locked” your cuboid bone (one of the metatarsals). If the pain is located where your finger drops off the bone, you have most likely stressed the tendon that inserts on the base–the peroneal tendon.

You can find this spot by following long bone of the foot (metatarsal) from its head at the toe end to its base in the mid foot. I am assuming from your description that the pain is on the lateral side of the foot at about the level of the base of the fifth metatarsal. I hope you will have the chance to complete many more. Is this just an injury from the repetition of running, or should I be concerned? I'd like to start running this weekend.-NicoleĬongratulations on finishing your first marathon.

I went to bed and woke up the next morning with a slightly swollen left foot (left side of the foot just above where the arch meets the heel).

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