Tennis elbow, as the name suggests, is a medical condition afflicting the tendons, which join your forearm muscles to the bony part of your elbow. In severe cases, pain can also spread to the wrist and rest of the arm and shoulder. However, playing tennis is just one of the many activities that can result in tennis elbow symptoms. Simple activities like raking your yard, plumbing with heavy tools, painting, weaving and other activities, which involve a similar back and forth motion, may result in tennis elbow. Tennis elbow is an injury caused by overuse or poor technique straining the tendons in that region.