The University of Mississippi Medical Center states that it is possible for one arm to be longer than the other. According to the UMMC, a difference in the length of either individual’s arms or legs is called limb length discrepancy.
The UMMC lists congenital deformities such as dysplasias, developmental deformities such as improper fracture growth or infections, and diseases such as osteomyelitis as possible causes for the limb length discrepancy. When the discrepancy causes a negative impact on the individual’s life, it is possible to undergo limb lengthening surgery to correct the limb. This is most commonly done with discrepancies in the legs.