Pain in knee joints for more than two weeks and it's more severe in the morning what could be the reason and can it go by itself or by some walking?

Knee pain: Since your symptoms have persisted for 2 weeks It's time to consult a physician or rheumatologist to determine the cause of your arthralgia. Because both knees ache, autoimmune disorder(like rheumatoid arthritis, lupus) or systemic infection are possibilities. Lack of knee redness,tenderness or swelling make bacterial infection of the knee joints unlikely. Any nonjoint symptoms which help diagnos