Massages are known for relieving aches and pains associated with muscles tension, but the relaxing therapy may also put more people at risk for nerve injury, according to a Reuters report.

Researchers at the Mayo Clinic in Scottsdale, Ariz., examined a recent case—one they claim is the first to link massage to nerve injury—of a woman who reported nerve injury in her shoulder, following a massage.The woman first reported the pain during a massage, and the pain persisted afterwards to the point of weakness in her left arm.

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Her MRI showed significant swelling in her upper left side and abnormalities in her left upper back, which doctors diagnosed as nerve compression injury. The woman has had physical therapy, which improved her condition over a six-week period. However, she still suffers from persistent mild pain in her shoulder.