A rotator cuff is a group of muscles that support your upper body. This rotator cuff injury can cause a dull ache in the shoulder making hard in the movement. This injury mostly occurs in the old age people, but it can also affect those people, who are highly active in physical activities like sportspersons and carpenters. The recovery can be made by exercising and therapy. Sometimes it can be really painful and a serious issue that is very hard to recover.