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Treatment of knee and foot pain:
First of all, there are different causes of pain in the knee and foot, so it's recommended to visit a specialist doctor (orthopedic surgeon) for further assessment of your condition and then treat it accordingly. In case of osteoarthritis (Knee joint roughness), the treatment includes pain killers such as Ibuprofen 400mg twice a day, putting some ice packs on your knee twice a day to reduce oain and swelling and try to avoid standing for lomg time. If there is no improvement, the doctor may prescribe steroid injections in the joint. If still you have symptoms despite the previous treatments, the final treatment is to replace the joint surgically. It's also recommended to reduce weight to reduce pressure on your knee joint, in addition to do some exercises that strengthens your thigh muscles, as well as having some physical therapy sessions.
Regarding foot pain, it may result from walking incorrectly (limping) due to knee pain, which can be improved with the use of the above-mentioned pain relievers. Diclofen cream can be used twice a day to paint on the foot, and Relaxon cream to relax your muscles.

Diagnosis:
Clinical medical examination by an orthopedic specialist and taking the patient’s medical history, complete blood test to rule out infection, an x-ray of the knee joint, and tests for gout can be done by examining uric acid in the blood, and taking a sample from the joint in some cases.

Causes of knee pain:
1. Knee osteoarthritis
2. Rheumatoid arthritis
3. Gout
4. Tendonitis
5. Trauma or knee injury
6. Other reasons

Recommendation:
It's recommended to follow the previous advices and to see orthopedic doctor for further assessment and management.