What is tendinitis?
Tendonitis is the inflammation of a tendon (the structure in your body that connects your muscles to the bones). The condition causes pain and tenderness just outside a joint. While tendinitis can occur in any of your body’s tendons, it’s most common around your shoulders, elbows, wrists and heels. More people refer to tendinitis as tennis elbow, golfer’s elbow, pitcher’s shoulder, or jumper’s knee. If tendinitis is severe and leads to the rupture of a tendon, you may need surgical repair. But most cases of tendinitis can be successfully treated with rest, physical therapy and medications to reduce pain.
Tendonitis is your body’s way of telling you, “Enough! You’re putting too much stress on this muscle and joint.” 
How do I prevent tendinitis?
Ease up. Avoid activities that place excessive stress on your tendons, especially for prolonged periods. If you notice pain during a particular exercise, stop and rest.
Mix it up. If one exercise or activity causes you a particular, persistent pain, try something else. Cross-training can help you mix up an impact-loading exercise, such as running, with lower impact exercise, such as biking or swimming.
Improve your technique. If your technique in an activity or exercise is flawed, you could be setting yourself up for problems with your tendons. Consider taking lessons or getting professional instructions when starting a new sport or using exercise equipment.
Stretch first. Warm up thoroughly, gradually building the intensity level of your workout. Cool down after the session.
Use proper workplace ergonomics. If possible, get an ergonomic assessment of your work space and adjust your chair, keyboard and desktop as recommended for your height, arm length and usual tasks. This will help protect all your joints and tendons from excessive stress.
Prepare your muscles to play. Learn the proper technique for any exercise or activity. Work out consistently, not just once a week.
