Please help, pain and swelling behind both knees

Patient : Hi all, I woke up Wednesday morning with a really sharp pain behind both my knees which hurt to bend. Behind both knees there was a swollen area which felt like they were full of fluid. There was no bruising and no real redness. I don't suffer from arthritis and now 3 days on my right leg has returned to normal but my left is still slightly swollen. Does anyone know what could've caused this? I haven't felt ill or had any other symptoms. I was drinking the night before along with boiling hot weather and a fair bit of walking but found it strange that behind my knees swelled on both legs. Please help! Thank you
Symptoms:  Slight swelling and pain
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