My recent emergency hospital entry started (I believe) with a very painful knee. Fir approx a fortnight, my left knee was painful whether I was sitting, lying down, bended or straight, that I was having serious problems moving around indoors.
Eventually, tried to make an appointment at GP, and got told I would need to wait for this for ten days. when I came of the phone I was upset, and had been feeling very cold all that day.
Within hours, my daughter had got a 111 appointment for me at that same GP,and whilst there I became so ill, that they called an ambulance and I was cat. 1 to A&E.
Diagnosed with infection, loads of anti-biotics, in patient for 48 hours, only allowed home when I said someone could stay with me.
Slow recovery from all of this and since then no pain in knee - so I assume that is where the infection was.
So, my advice, is DO NOT IGNORE - go to GP