There are variations in the way that Shoulder Impingement Syndrome can present itself. In some patients, the pain will come on suddenly and without warning, while for others, the build-up of pain will be slow and gradual. The main symptoms of Shoulder Impingement Syndrome include:
A painful sensation in the outer side or top of your shoulder
More intense pain whenever you lift your arm (more noticeable the higher you lift it)
An aching sensation or steady development of pain at night
A general weakness in your arm that you have not noticed before
Often, Shoulder Impingement Syndrome is confused for a frozen shoulder. However, the difference is that a frozen shoulder will usually result in a stiffness of the arm that is not present in Shoulder Impingement Syndrome.