Pain when twisting the hand and arm, as in using a screwdriver or playing tennis. Sudden strain on the forearm. Participation in sports that require strenuous or repetitive forearm movement, such as tennis. Poor physical conditioning. Take frequent rest periods.
Tennis racquets can aggravate tennis elbow.
Get professional help if you are just learning tennis. Technique and conditioning are important in preventing injuries. Do forearm conditioning exercises to build your strength gradually. Warm up slowly and completely before participating in sports, especially before competition. Your own observation of symptoms.