I have a kind of ache in my legs thigh and knee , it pains sometimes but i don't have any problem in walking can you please help.

Help: You know that you cannot be diagnosed online-right? Please make an appointment to have a complete physical exam to include blood and urine testing and a neurological and vascular evaluation of your complaints. You can try OTC Aleve (naproxen) or Advil, if not allergic; however, do not ignore these symptoms.

Depends: It depends where exactly the pain is and what makes it better or worse. Can you characterize it? You could have a problem with the ligament or joints in your hip/knee.