Just above the interior of my elbow and below my bicep, there is an aching pain that occurs when I play tennis. It started aching two days ago shortly after practicing some serves. Now, after about 20 minutes of play, I can barely swing my right arm because of the dull pain (note that it hurts the most when I extend it).

I've never had a past injury pertaining to my arm and have never experienced the pain before. Below I've linked an image that hopefully give a better idea of where it aches. The area where the pain is located is circled in blue.

LINK: http://img832.imageshack.us/img832/1650/elbow.png

Just to reiterate, it is a dull, aching pain. I can almost compare it to someone grabbing my elbow and applying a vast ammount of pressure to it and not letting go.

If anyone has any idea what this main be, it would be greatly appreciated. If the pain doesn't stop or lessen within the next day or two, I plan to see my school trainer.

Original image taken from http://celebritydiagnosis.com/wp-content/uploads/2...

Thank you for the one who told me it may be golfer's elbow. Now I'm thinking the pain is in the medial epicondyle. I presume it's because I served a ball too hard and might've swung my arm in a way it wasn't supposed to. So, would anyone have any suggestions as to how I could stop the pain? Perhaps just rest and not play tennis for a few days?