3. Swelling on a lower leg or ankle is another sign to look out for when a person thinks she or he has peroneal tendonitis.
Pain may be felt when swelling is present. The swelling will not go away on its own, especially if the injury is still being worked on, such as running. Swelling can be alleviated by propping the feet up and doing ice massages every day for at least five minutes.
Even if the swelling goes away, it’s not a good idea to work on the ankle until the doctor gives the person the okay to go back to doing any physical activity. Even standing on the job can cause swelling to persist. The longer a person is on their feet, the swelling and pain will be there. The swelling and pain may go away in a few weeks to several months depending on how damaged the peroneal tendonitis has become.