The most common symptoms of tennis elbow are pain in the area around the outside of the elbow and forearm muscles. You will experience tenderness, weakness and loss of grip strength in 3 stages.
In stage 1, the pain usually worsens with bending or rotation of the wrist and forearm, and can be felt at night when sleeping on the affected arm.
In stage 2, you may feel pain when you bend your wrist backward (extension), grip an object (hand strength), or raise your hand to shoulder height (elbow extension). In stage 3, you may feel elbow or arm pain with any activity involving use of the arm.
Left untreated, lateral epicondylitis can lead to chronic pain that degrades quality of daily living. Therapy is highly effective at eliminating pain and increasing strength in the elbow. (MayoClinic.com. 15 Oct. 2008. Web. 10 Oct. 2010, Journal of Shoulder and Elbow Surgery. 19 (6): 917–922, The New York Times, August 25, 2009)