Our expert says:
If it's only one side, and it happens as a result of running then it may be a slight muscle strain as a result of running. The impact of running would hurt it, but it's obviously not too severe, and that allows you to return a few days later. So a mild muscle strain perhaps.
The only way to completely overcome this is to back off the activity causing the pain - the running, and allow it to settle. Maybe try cycling, or stairs, or eliptical or something else, for a week or two, and then ease back into it. It's not too difficult to twinge a muscle midly, and often you won't realise it.
If it persists, then I'd recommend seeing a physio, have it diagnosed and rehabilitated. But first try to bring down training volume and see if that has any effect.
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