What causes tightness and pain in the knee?
Patient: Worked out last Friday, including a 35 min run...everything good. My left knee tightened up that evening...never have had any problems with either knee. Since then, when I get up in the morning, knee feels OK but as the day goes on, it tightens up and is painful. When I sit for a long period, it is painful to stand and strertch out my leg. Eventually it stretches out and feels better but still somewhat painful. I am 63 years old and in excellent health. Never had any problems with my legs. Doctor: Hello,  If I was your treating doctor for this condition of the knee, it could be of the following possibilities.   First - Mild ACL - Anterior Cruciate Ligament injury. Often we can diagnose with a physical examination.   An ultrasound and an MRI will confirm the diagnosis. If it is so I suggest providing rest to the joint, use kneecap while moving around and also avoid jerky and quick movements of the knee.   Secondly - mild osteoarthritis - This can be diagnosed with an x-ray. It can be diagnosed with physical examination too.   I suggest to consult a physician and get an X-Ray of the joint done to rule out the other possibility.   Hope I have answered your query. Let me know if I can assist you further.  Take care  Regards, Dr Mahesh T S, Ayurveda Specialist