Personally, I think it's the shooting posture. Shooting should be a coordinated action. The whole movement is transmitted from the foot to the upper body, and then the hand naturally swings upward with the power of take-off. After the posture is taken directly above the head, pick up the ball with your wrist and shoot. So it is very likely that there is something wrong with the posture of long-term exercise, which leads to water accumulation in the elbow. Therefore, if you like playing basketball, you should develop good playing habits, solid basic skills and correct habit of exerting strength, so as to keep healthy and play for more years. It is suggested to warm up more before playing, especially the arms, and then start playing.