The difference between shoulder pain and upper arm pain mainly has different causes, different parts, different high incidence of people, and different nature of pain. 1. Shoulder pain is pain in the shoulder, which is mainly considered to be caused by frozen shoulder. Clinical symptoms include pain that prevents you from lifting your arm, scratching your back, and other movements in all directions. The most common age is around 50 years old. The disease is also known as fifty shoulders. Shoulder pain alone should be considered to be caused by cervical spondylosis, which may cause numbness and pain in the upper limbs. Shoulder pain usually worsens at night and is more common in people around 50 years of age and is more common in women than men. 2. Upper arm pain often occurs in the front and outside of the upper arm. Anterior pain is usually caused by lesions of biceps and long head tendons in the anterior part of the shoulder joint, and the pain may radiate to the biceps in the front of the upper arm. There is a possibility of pins and needles or cramp-like pain in the biceps during activity. It is more common in young adults, and is more common in men than in women. Excessive weight bearing on the shoulder joint and prolonged exposure to cold also can lead to fatigue injury to the muscle, causing upper arm pain. When shoulder pain and upper arm pain occurs, it is recommended to consult a doctor to clarify the cause of the disease and give standardized treatment under the guidance of a doctor.