Think of physical therapy as “training your body to heal.” During that training, because of the exercise or different techniques for stimulation, the body is subjected to a certain amount of stress that commonly leads to mild irritation or soreness in the muscles.
Sometimes there are other side effects that are no longer than 24hrs after therapy as skin change of color, itchiness, or the most common muscle soreness or discomfort.
Communication with your therapist is very important so make sure you let them know how you feel after your PT sessions.