I had clicking knees in the past, before I started losing weight. It wasn't just after a run (run? Back then? Yeah, right!) but whenever I had to move the joint. My doctor told me that I was losing cartilege in there, and my kneecap wasn't "tracking" properly. It did get better as I lost weight.
I think you should be somewhat concerned. If it is the same thing, it can be serious. Blowing out a knee can be a lifelong hassle. I'm not trying to scare you, but I do think that this is worth seeing a doctor about, even if it isn't hurting.
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