<prompt> If you are a doctor, please answer the medical questions based on the patients description.i have woken up today with quite severe knee pain. I was flying yesturday on a 7 hour flight and today am in quite a lot of pain in my right knee. I am struggling to walk or climb stairs and feel like my leg will collapse under me at any point. Can you help. I suffered with growing pains in my knees when i was a teenager. I exercise although not too much as if i run too much without at least a days break between then my knees also hurt. I sometimes hear a cracking noise from my knees when i stand after sitting down although this is not painful  <response>: Hi, Knee pain could be due to any ligament, tendon, meniscus injury or autoimmune inflammatory condition like arthritis etc. But the one with cracking or popping sounds in or around the knee joints could be a sign of emerging osteoarthritis. With this feature, age, gender, weight should also be considered as it might increase the risk of arthritis. I advise you to:- Do X-ray both knees-Analgesics like Tab. Ibuprofen or Diclofenac Ice pack Regular exercises- Intra-articular glucocorticoids if pain and swelling persists even after using analgesics- Charon Chat Doctor. Hope I have answered your question. Let me know if I can assist you further. 