a focus of hyperirritability in a muscle that causes pain and tenderness at rest or with motion that stretches or loads the muscle
                                                            
                                                     
                        
                                                
                        
                        
                            a focus of hyperirritability in the muscle or its fascia that generates pain
                                                            
                                                     
                        
                                                
                        
                        
                            an area of extreme tenderness that usually lies within the skeletal muscle and which is associated with a local or regional pain