knee pain only when sitting

My friend said he gets aches in his knee if he sits for a long period time.He is pretty inactive and I thought this may be the cause.He dosn't get it unless he is sitting for a while.
 
that certainly could be the case, how old is he?

Probabaly the cause of weakness in parts of his leg which transfers the stress to the knee. Only a more detailed analysis will tell !
 
believe it or not I had the same issue.....

What did I do to resolve it?

Well what I was doing was pressing my knee against the Desk leg while sitting, not sure why but I was doing it. So basically I was just pushing my knee into a metal bar subconciously, once I learned to stop doing that I've been fine. I know this is rare, but I never realized I been doing this.

also when I am dehydrated, my knees are the first thing to hurt, is he getting enough liquids?
 
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