The shoulder joint is the only joint that connects the body to the upper extremities and is the most flexible joint in the body, allowing almost 360 degrees of movement, but it is also the “most vulnerable” joint. Shoulder pain is a very common clinical condition, and according to foreign statistics, 30% of all people are likely to suffer from shoulder pain in their lifetime. In people over 50 years of age, the incidence of shoulder pain is over 50%. Because people have a biased understanding of shoulder pain, whenever they hear “shoulder pain”, they think it is “frozen shoulder”. In fact, the causes of shoulder pain are very complicated, both for the shoulder joint itself and for the cervical spine, heart, gallbladder and other organs. The causes of shoulder joint itself are such as “bursitis”, “rotator cuff injury”, “shoulder dislocation glenoid injury”, “adhesive shoulder arthritis “”Shoulder fracture”, etc. Engineer Zhang, 55, has been practicing calligraphy and doing housework at home since he retired from teaching. In the past six months, the pain in his right shoulder has been bothering him, not only can’t practice calligraphy for too long, even washing his face, combing his hair, hanging and drying clothes are very difficult, and at night the pain in his shoulder makes it difficult for him to sleep. Colleagues and neighbors said she had “frozen shoulder” and asked her to go to the community fitness square to “stretch and exercise”, but two months later, Zhang’s shoulder pain did not ease, but gradually increased. After careful examination of all aspects of the shoulder joint, I gave Mr. Chen the initial judgment that it was not “frozen shoulder” but “rotator cuff injury”. This was very surprising to Mr. Chen. I explained to him in detail that the rotator cuff is a group of tendons (commonly known as “tendons”) that drive the shoulder joint activities, the rotator cuff is moving in the gap between bone and bone, there is wear and tear and extrusion, long-term lifting of the shoulder (such as engineers drawing, wall painting) will aggravate this wear and tear, over time, the tendons will be damaged or even ruptured, called “Rotator cuff injury”. Excessive “stretching exercise” may make the original fragile tendons “more injured”, “the more practice the worse”. A magnetic resonance imaging (MRI) examination also confirmed that Zhang’s rotator cuff tendon was indeed “damaged and broken”. Luckily, Zhang’s injury was not serious and he improved after two shoulder puncture injections. Shoulder pain is not the “patent” of the elderly. Xiao Liu is a freshman, love badminton, he has experienced a shoulder trauma. I thought it was just a simple muscle strain, rest for 2 weeks will be better, but after half a year of injury Xiao Li’s shoulder pain did not improve, and even writing homework, wearing sweaters will be painful, more afraid to play badminton. Realizing the seriousness of the problem, his parents took him to a number of hospitals and treated him according to “frozen shoulder” and “synovitis” but he did not get better. After a detailed consultation and careful professional examination, I reviewed the circumstances of Xiao Liu’s injury and concluded that he might have a “SLAP injury of the shoulder joint”. SLAP injury, also known as shoulder labral injury, is common in young people with repeated throwing sports (basketball, badminton, tennis, triathlon, etc.) and is characterized by “shoulder pain, fear of force, reduced throwing and lifting power”. An MRI later confirmed the diagnosis. He then underwent minimally invasive arthroscopic surgery, during which we found that the glenoid labrum of the shoulder was torn from the periosteum, so we fixed it with titanium anchors. After more than a month of rehabilitation, Li returned to school. Not all shoulder pain is “frozen shoulder”, the real frozen shoulder only accounts for one-fifth of shoulder pain and can usually resolve itself after a year or so of correct stretching exercises, while the more common “rotator cuff injury” and “glenoid labrum injury” need more attention. The more common “rotator cuff injury” and “glenoid labrum injury” need to be taken more seriously, and it would be counterproductive to treat them blindly as “frozen shoulder”.