A chair (1) for relieving back pain of a user, with a seat surface (2) and a backrest (3), wherein a backrest angle (4) between backrest (3) and seat surface (2) is adaptable. At least one support element (5) for supporting the upper body of the user, when the latter is in an intended sitting position, is arranged on the backrest (3), wherein the support element (5), in the intended sitting position, can preferably be arranged, or is arranged, under the armpits of the user. The support element (5) is designed in such a way, and arranged on the backrest in such a way, that it can be moved by the user in order to obtain a desired support of the upper body at a predefined backrest angle (4) while he is in the intended sitting position.
