Most of the time, if the pain is manageable and/minor, most patients can recover by resting the injured area and avoiding overhead activities (sports, etc) as well as carrying heavy loads at arm's length.
Physiotherapy may help in re-training the rotator cuff, as well as the muscles that control your shoulder blade, In doing so, it helps reduce the impingement by creating more space for the tendons and bursa.
Painkillers and Injections
On occasion, painkillers may be required. In selected cases, steroid injections to the bursa may help relieve the symptoms. Steroid injections do carry some risk and this should be discussed with your doctor before proceeding.