A lordosis adjustable back brace device supports a desired shape of the spine. The device includes a belt for extending around a torso of a human. The belt has a front closure and is positionable in a closed loop. A support panel is coupled to the belt such that the support panel projects from an inner surface of the closed loop towards a center of the closed loop. The support panel abuts the torso and has a curved surface facing the center of the closed loop. A curvature of the curved surface extending between lateral edges of the belt is adjustable.