Tai chi practice appears to be very safe. A systematic review of adverse events in the tai chi literature was conducted in 2014 and found 50 of 153 eligible randomized controlled trials reported any adverse events. Most of these trials found no adverse effects. Of the events that did occur, none were serious. The most common events were minor musculoskeletal pains (knees, ankles, low back). Nine falls were reported, but out of thousands of patients, many of whom are referred to tai chi for problems with balance, this is probably neither surprising nor alarming.