Here is a way to differentiate between cervical spondylosis and frozen shoulder: both can cause pain in the shoulder and upper arm, but the age of onset, the nature of the pain and the location of the pain are different. The difference is as follows: 1. The shoulder pain caused by cervical spondylosis usually does not exceed the shoulder peak (the highest bone in our shoulder!) The pain is mainly in the neck and the medial side of the neck and scapula as well as the trapezius muscle. If the nerve is affected, there will be numbness and pain in one or both upper limbs. If the nerve is affected, there will be numbness and pain on one or both upper limbs. It will not cause limitation of shoulder movement in the affected area. 2.Frozen shoulder is also known as 50 shoulder, shoulder condensation, frozen shoulder. It mainly affects middle-aged and elderly people around the age of 50, but also develops after trauma due to strain on the tendons around the shoulder (called traumatic frozen shoulder). It can be divided into four phases according to its clinical characteristics: painful phase, adhesion phase, remission phase, and recovery phase. The duration of the disease is long, ranging from two months to two years. At the beginning, the pain is mainly painful and the movement of the affected limb is limited. However, the pain is mainly confined around the shoulder joint. Gradually, it develops into a limitation of movement, and in severe cases, it can cause atrophy of the shoulder muscles! This can affect the recovery of function in the future!