Please help, pain and swelling behind both knees

Patient

Q: 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
Doctor

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