My left have in the join elbow is in pian what could cause it?

Elbow Pain?: If the pain is in the elbow it is important to know if related to trauma, acute or gradual onset, related to tingling or numbness. Also the location: inside near body, outside, back or front. Not enough information here to be specific. Consider resubmitting question with more specific information. This will help us to help you.

Hard to say: It needs to be evaluated. It depends on what other medical conditions you have, any injury, recent infection, medicines taken, etc.

Several possible: Conditions could cause elbow pain. If it does not respond to tylenol, (acetaminophen) then get an exam with your doctor to get an accurate diagnosis.