Hepatic hematoma. Hepatic hematoma is a painful liver condition, which The New England Journal of Medicine says has been instigated by deep tissue massage. In this case, a 39-year-old woman received a deep tissue massage, which included the abdomen and right upper quadrant. Within 24 hours, she developed abdominal discomfort, nausea, and pain in her right shoulder. A large hematoma was found in her right hepactic lobe, causing the woman to feel nauseous and have a fever for the following six months.
Interestingly, many patients and therapists swear by massage as a way to reduce constipation or digestive upset, since the increased circulatory benefits and relaxation of the abdominal and lower back muscles can help relieve symptoms. In fact, a 2014 study from the British journal Nursing Standard highlights a number of the ways abdominal massage encouraging muscle contraction, nudging the gut to move things along.