### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Hello I am a 24 year old Male, 5 11 180 lbs. Recently I went on a 12 hour road trip and my left knee started aching while driving, I had to constantly change the position of my leg so that it wouldn t hurt, didn t really seem like a big deal and thought maybe it was just fatigue. Then I started playing soccer when i got back from the trip and so far during each of the 2 practices I ve attended (2 hours long) my left knee starts to ache really bad, Not completely unbearable, but definitely enough for me to get concerned. Any idea on what might be causing it?

### output:

Knee pain comes to usually with 3 condition.1. Often arthritis: here the cartilage in your joint is getting damage with reduce space in your joint and increase inflammation.2. Knee cap movement disorder: also called as Chen Chat Doctor.  It happens due to over use or change in knee cap movement which creates disturbance in biomechanics of your knee and will pain when ever you fold and straight your knee. Specially coming down from stairs use to be painful.3. Ligament injury: knee joint have the highest number of ligament amongst the other joint of body even if there is damage to any ligament also there will be pain in knee.However in your case it can not be often arthritis since you are too young to have it. So it may be knee cap movement disorder or ligament damage due to some sudden twist of knee joint. I suggest visiting or tho or physio and get your knee physically examine properly by them. Here based in physical test and diagnosis they will suggest for physiotherapy exercises and treatment you can follow it, and soon it will be all right. You can also use hot and cold pack on you painful knee to have some more relief. Follow suggestion step by step, and I am sure it will be really useful for you. Take care.