I frequently run, both outdoors and on treadmills, often around 3-6 miles. This feels great, both during and after. However, for about two years now my knees have been bothering me: a sort of mild pain around my kneecap plagues me whenever I stand for extended periods of time. This is problematic during e.g. my work (in a lab) or during cooking. I have really come to hate it.
On top of this the tendon above my kneecap sometimes seemingly 'catches' and snaps into place when bending my knees more than 90 degrees, though this is painless.
I am 22 years old and very fit and healthy apart from this. I have stretched and foam rolled the shit out of my quadriceps, hamstrings and calves but this does not rid me of my pain.
Advice/experiences/comments would be greatly appreciated.