Trauma is a common cause for tennis elbow, and many cases result from a blow that makes the tendon swell and deteriorate. The tendon is also vulnerable to many extreme actions, forces, or activities, any one of which can injure it.
Tennis elbow can also be caused by overuse. The tendon associated with the condition can be strained through any activity that stresses its attachments. For example, activities involving gripping (e.g., grasping a tennis racket) and repetitive motion (e.g., weaving, painting, auto repair) can also create stress.