You typically have pain around a joint, especially if you continue to use it a lot in hobbies, sports, or on the job. It may feel weak, look swollen and red, and feel warm to the touch. In rare cases when infection causes tendinosis, you also could have a rash, fever, or unusual discharge. Other symptoms depend on where the inflamed tendon is.
Repeated motions in activities like carpentry or landscaping, and sports like tennis, golf, skiing, and baseball, are common culprits. But it can also happen quickly from a sudden strain, or if you do something new, especially over your head, like painting the ceiling. Long-term tendinosis also might be due in part to age or diseases like arthritis that wear down your tendons and other tissues.
