Because the shoulder can be unstable, it is the site of many common problems. They include sprains, strains, dislocations, separations, tendinitis, bursitis, torn rotator cuffs, frozen shoulder, fractures and arthritis.
Types of arm injuries include
Some nerve problems, arthritis, or cancers can affect the entire arm and cause pain, spasms, swelling and trouble moving. You may also have problems or injure specific parts of your arm, such as your hand, wrist, elbow or shoulder.
Hand problems include
Sources
MedlinePlus - Shoulder Injuries and Disorders
MedlinePlus - Arm Injuries and Disorders
MedlinePlus - Hand Injuries and Disorders