I would re think your seating posture. You're probably trapping a nerve or something which means your posture is not relaxed. Also consider alternating between sitting and standing especially if you're playing electric.
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Just for the sake of science, try and sit cross legged like you normally do while practicing but without the guitar. And for the same duration too, of course. How does your leg react? And what if you do it with the other leg on top?
It's because you're suffering from an overload of "toan," which, as all experienced guitar players know, is stored in the balls.
Source: /r/guitarcirclejerk