I feel pain in my knees.

I signed up on here to find out if you guys could help me with a problem I suffer. I work out for about 5 days in a week and I do squats and dead lifts as a part of my fitness training plan from Athletic Edge in Toronto. But, sometimes I feel pain in my knees and quads after completing my physical exercise. Is it a serious problem? Should I need to take any medical assistance? Any advice would be appreciated.