Sudden pain in the right pinky is not usually a sign of heart disease, as the heart is an organ, and most of the pain occurs in the heart, which is the stomach, and radiates to the back of the left shoulder or the left hand, which is very typical. Sudden pain in the little finger of the right hand is thought to be related to trauma, and tenosynovitis can also occur. In case of cervical spondylosis or ulnar nerve injury, the pain in the little finger can occur, and it is not always a sign of heart disease.