Generalized lymphadenopathy
Generalized lymphadenopathy is swollen lymph glands in many areas of the body.

Usually this is in response to a body-wide infectious disease such as influenza and will go away once the person has recovered, but sometimes it can persist long-term, even when there is no obvious cause of disease. This is then called persistent generalized lymphadenopathy (PGL).

Causes of generalized lymphadenopathy
Infection :
Viral : Infectious mononucleosis, Infective hepatitis, AIDS
Bacterial : Tuberculosis, Brucellosis, secondary syphilis, Tularemia
Protozoal : Toxoplasmosis
Fungal : Histoplasmosis
Malignant :
Leukaemia
Lymphoma
Metastatic carcinoma
Immunological :
Systemic lupus erythematosus
Felty's syndrome
Still's disease
Drug hypersensitivity as Hydantoin, Hydralazine, Allopurinol
Misc. :
Sarcoidosis
Amyloidosis
Lipid storage disease
Hyperthyroidism