An bleeding disorder with a decreased antigen and/or activity of factor X (FX) that is acquired. Acquired factor X deficiency is a rare disorder, commonly associated with a preceding viral illness and a circulating FX inhibitor. Although multiple treatment modalities have been described with variable success, in many cases, it is a self-limited condition. The disease is MONDO_0021134 (acquired factor X deficiency). Also known as: aFX.