Swollen ankle from running?

Hi everyone. I have a question. I've always run off and on but for the last few months I've been more regular about it. I run 4-5 days per week on the treadmill averaging about 2.5 miles per run. Today I noticed my ankle is swollen. Does this mean I run too much? Could running shoes be the problem? I'm not sure what I'm doing wrong.

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