What is that shocking that i feel once or twice a week that goes through my knee for couple of secs?

Question:

Answers:
Many times u see the doc tappin sumwuns knee . when u bang ur knee against somthing , the nerves in there trigger a shock . nah nothin serious , but if it doesn't , then its a nerve or brain prob .

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What is that shocking that i feel once or twice a week that goes through my knee for couple of secs?

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