Osteoarthritis, Ligament damage, Meniscus damage
or Patello-femoral disorder.
Your symptom of pain
over upper portion of knee
suggests that it might be due to Patello-femoral syndrome.
When did your pain begin, what were you doing at the time, and what were the initial symptoms?
Do you experience any grinding, locking, catching, or giving way of the knee?
Are there any positions that make your knee more or less comfortable?
What is the quality of your pain (sharp, shooting, dull, etc.)?