Some doctors believe that MCS has a physical cause, others believe that it has a psychological cause, and still others point to both physical and psychological factors.
فبعضهم يعتقد السبب جسديا والبعض الآخر نفسيا ؛‏ وآخرون يشيرون الى العاملين الجسدي والنفسي معا .‏