Tendinitis, also known as tendonitis, is a condition characterized by inflammation and irritation of a tendon, the thick cord that attaches muscle to bone. It often results from overuse, repetitive movements, or injury. Commonly affected areas include the shoulders, elbows, wrists, knees, and heels. Treatment for tendinitis typically involves rest, ice, compression, and elevation (RICE), along with nonsteroidal anti-inflammatory drugs (NSAIDs), physical therapy, and in some cases, corticosteroid injections. Proper diagnosis and a tailored treatment plan are essential for managing tendinitis and promoting tendon healing.