Background: A shoulder’s pain becomes more and more popular affection. They affect young just as older people. Young people are exposed for quite frequent, forced accepting a sitting position at work, but also for injuries associated with practicing careless physical activity. In turn, for elder people a summing up of overloads over a distance area of the entire life. There are many causes of the painful shoulder. Scientific sources are announcing that about 40–60% of all kinds of shoulder pains are caused by subacromial impingement syndrome. Subacromial impingement syndrome is an articulation’s dysfunction. The study objective was to assess the effectiveness of mobilization technique during subacromial impingement syndrome therapy. Material and methods: The study group consisted of 30 patients who were diagnosed by physiotherapeutists and orthopaedists – a subacromial impingement syndrome. The study group account for both female and male sex. The patients were directed to rehabilitation centre for two weeks procedures program. During rehabilitation, patients had a humeral joint’s mobilization. A visual analogue scale and a modified Laitinen’s questionnaire of pain assessment was used in the research. Both scales were used before and after a rehabilitation program. The Commission of Bioethics’s permission was approved to carry out the study. Results: The common principles of treatment of the patients with subacromial impingement syndrome were: a reduction of pain level, an increase of movement extent in humeral joint and a reduction of pain frequency compared with position before rehabilitation. Moreover, after rehabilitation, patients applied reduced number of analgesics. Only two patients, in spite of intensively conducted rehabilitation program, did not get better improvement of health condition. Conclusions: An application of mobilization techniques in the treatment of subacromial impingement syndrome is an effective method improving the quality of patients’ life. The introduction of mobilization techniques in the rehabilitation program of subacromial impingement syndrome helps to reduce the intensity of pain. It is also a beneficial treatment that affects the increased range of motion in the joint. Moreover, it helps patients to reduce the amount of medication.