Tendinitis is a condition that occurs when a tendon, which connects muscles to bones, becomes inflamed or irritated. This often happens due to repetitive movements or overuse, making it common among athletes and people with physically demanding jobs. Symptoms typically include pain, swelling, and stiffness in the affected area, which can make everyday activities difficult. Common types of tendinitis include Achilles tendinitis, affecting the heel, and tennis elbow, which impacts the elbow joint. Treatment usually involves rest, ice, and anti-inflammatory medications. In some cases, physical therapy may be recommended to strengthen the surrounding muscles and improve flexibility.