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Treatment can take months and sometimes requires surgery, but it’s usually possible to get back to running pain-free.

When people think of running injuries, they often think of the knees, but the Achilles tendon is another area that requires attention: it bears body weight and repeatedly transmits considerable force.

A protein called HIF1 may be the missing link behind painful tendon injuries like jumper’s knee and tennis elbow. Researchers showed that high levels of HIF1 actually cause harmful changes that make ...