WAagenaes syndrome
WAllergy
WCaspase-8 deficiency
WCastleman disease
WCutaneous small-vessel vasculitis
WDennie–Morgan fold
WDOCK8 deficiency
WEosinophilic esophagitis
WEosinophilic gastroenteritis
WFamilial Mediterranean fever
WForeign body granuloma
WGarlic allergy
WGraft-versus-host disease
WGulf War syndrome
WHistory of chronic fatigue syndrome
WHLA-B27
WHyper-IgM syndrome type 2
WHyper-IgM syndrome type 3
WHyper-IgM syndrome type 4
WHyper-IgM syndrome type 5
WHyper-IgM syndrome type 1
WIdiopathic CD4+ lymphocytopenia
WIdiopathic multicentric Castleman disease
WIgG4-related disease
WKimura's disease
WMastocytosis
WOpportunistic infection
WPityriasis lichenoides et varioliformis acuta
WPLAID syndrome
WRAS-associated autoimmune leukoproliferative disorder
WT cell deficiency
WTransplant rejection
WTRIANGLE disease
WUnicentric Castleman disease
WXMEN disease