ok so my question is regarding a knee problem. When I sit down for short or long periods of time and then get up I feel tremendous pain in my right knee as I straighten it out when standing. The pain only lasts for a few steps and once i'm on the move its gone. This only started about a month ago give or take.

FYI, I'm 27, male, about 175 cm tall, and currently weigh about 86 kg. Also note that 3 and a half months ago I was around 100kg and that's pretty much when I started working out on my fitness (crossfit training) to lose weight and improve my health in general. For the first month I would exercise 3 times a week then I raised that to 6 times a week, each session an hour long and even now I don't feel any pain while exercising or moving about in general.

should i be worried, is it possibly overtraining, do I need to get an x-ray perhaps?

Also note that I was unfit and overweight, well for a very long time, 10 years or more if it makes a difference in your diagnosis