I'm having painful knee joint pain, what can i do?

Knee pain: Try some ice and an anti-inflammatory pill. If no improvement get an xray.

Painful knee: You should consult with your doctor if this is a persistent problem.

Many possibilities: Pain and stiffness of a joint can be due to many things such as gout, infection, inflammation of the bursa, or due to tendon, cartilage, or bone abnormalities. Have it evaluated by a professional and get the appropriate treatment.