Tendonitis, if not well-rested, can easily recur. It mostly occurs during activities, work, or exercise, presenting with pain, swelling, and limited mobility. Tendonitis primarily involves the tendons, which are very hard connective tissues connecting bones and muscles. Tendonitis is mainly caused by the excessive use of muscle fibers and repetitive strain leading to degenerative changes in tendon collagen fibers. This accumulation of degeneration in tendon collagen fibers is commonly referred to as tendinopathy. Examples include common types such as Achilles tendonitis, patellar tendonitis, quadriceps tendonitis, or injuries to the rotator cuff, and lateral epicondylitis of the humerus. Long-term repetitive friction and fatigue can easily cause repeated episodes in these areas. Strict immobilization, along with physical therapy, massage, electric stimulation, and heat application can help alleviate symptoms. Additionally, taking blood-activating and pain-relieving medications, and when necessary, undergoing injective treatments can effectively prevent recurrences and promote relief, reducing symptoms.