Tendinosis is a condition that is caused by the accumulation of small-scale injuries on the tendon that do not heal properly, according to Tendinosis.org. It happens when the tendon's collagen is strained repeatedly, and the injury never gets time to rest and heal, states the National Institutes of Health.
Tendinosis occurs in various areas, including the wrists, elbow, shoulder, knee, heel and forearm. It results from playing musical instruments, playing sports, using the computer or doing manual labor, as stated by Tendinosis.org. Occupations that lead to risk of tendinosis include professional athletes, musicians, sign language interpreters, court recorders and assembly line workers. These individuals can minimize their risk of tendinosis by using better equipment, better working techniques, and by taking regular breaks. Warning signs of tendinosis include stinging, aching, burning, tenderness and stiffness in the affected area.