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

### input:
After standing on my feet for 3 hours with 15kgs of weight in my back in the airport passport control, I feel discomfort in my right knee. There is no pain but I am kind of feeling that it is not normal like before. I feel like my right knee is kind of tired and i feel discomfort with it. During walking I feel normal but after walking same discomfort appears back

### output:

Hello, I have studied your case. According to your symptoms and findings there is osteoarthritis of your knee. You can start cartilage protecting medication like Chen Chat Doctor. I will advise doing X-ray knee and if required MRI knee can be done and if there is severe destruction of menisci then arthroscopic shaving can be done. Physiotherapy like ultrasound and tens will help, along with knee exercises.Lifestyle changes will help in reducing pain which include, LOAD REDUCTION : Protecting the joint from excessive load may slow down the rate of cartilage loss. It is also effective in relieving pain. The heavier you are, the more stress you put on your joints. Weight reduction for obese patients, wearing shock-absorbing shoes, avoiding activities like climbing stairs and using a walking stick are worthwhile. ACTIVITY MODIFICATION -It is important to maintain as much activity and joint motion as possible, but impact activities will aggravate arthritis. Running and jumping will often accelerate cartilage loss from the joint. The key is to focus on low impact activities, such as swimming or cycling.  ANALGESIC MEDICATION : Simple over the counter medications like acetaminophen is sufficient in most cases. If this fails to control pain, a non-steroidal anti-inflammatory 