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If you have any illness or medical problem, then go and see a qualified medical practitioner (a Doctor), the internet is no place for medical diagnosis.

If you have recently eaten a very salty meal, it could be water retention. If you have been doing sports, you may have sprained it--it may be swollen. Alternate heat and ice on the knee and it should begin to feel better. If the knee still hurts in a few days, then get in to see the doctor.

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10y ago

What else can I help you with?