Since how long is the pain and tightening?
How severe is it on the scale of 0-10 (10 being worst)?
Does Ibuprofen decreases it significantly?
Do you have history of injury, or any reason of its cause?
Any concomitant illness like diabetes?
it has been going on for two days, the pain is a10, sometimes ibuprofen helps, no history of injury or any reason for the cause of it.
hurts to walk, seems like a tightening of the upper muscle and the knee sometimes is hurting. can not move it sideways without extreme pain.
This warrants an immediate examination and evaluation by a physician for ascertainment of the cause. Any pain which is severe or excruciating (pain of 8 or above) warrants, physician's attention as soon as possible. Some medical imaging like x-ray of MRI may also be required after the examination. This can be due to pinched nerve in the back, bursitis, or tendonitis. You may meanwhile alternate Ibuprofen and acetaminophen (paracetamol) alternate 4 hourly with application of local analgesic cream or spray.
Please feel free for your follow up questions.