Bad fatigue interfering with daily activities for 3 weeks.have lupus but recent labs were normal showing no flare.i am normally very active.causes?

This could: be a viral syndrome> (patients with Lupus do get viral infections at the same or slightly higher rate than the general population!) Do you have a fever?? Any contacts with people who were (are) ill??? Any travel?? Did recent labs include a CBC (Complete Blood Count) If so what was the White Cell count/Differential?? More info needed Hope this helps! Dr Z