<unk>  is swelling due to abnormal accumulation of interstitial protein rich fluid and fibroadipose tissue.
Occurs when lymphatic load exceeds capacity in the lymphatic system
Congenital<unk>  (6-12%) - before age 2<unk>  Precox (77-94%) - at onset of puberty<unk>  Tarda (11%) - after age 35
Cancer and cancer treatment (Lymphadenectomy, Radiotherapy) 
Breast Cancer - most common
Sarcoma
Lower Extremity Melanoma
Gynecologic Cancer
Genitourinary Cancer
Head and neck cancer
Infection
Lymphatic filariasis
Tuberculosis
Recurrent Skin Infections (eg. cellulitis, erysipelas)
Lymphadenitis
Obesity
Inflammatory disorders
Dermatitis
Sarcoidosis
Arthritis
Rheumatoid arthritis
Psoriatic arthritis
Juvenile Idiopathic Arthritis
Breast Cancer - most common
Sarcoma
Lower Extremity Melanoma
Gynecologic Cancer
Genitourinary Cancer
Head and neck cancer
Lymphatic filariasis
Tuberculosis
Recurrent Skin Infections (eg. cellulitis, erysipelas)
Lymphadenitis
Dermatitis
Sarcoidosis
Arthritis
Rheumatoid arthritis
Psoriatic arthritis
Juvenile Idiopathic Arthritis
Rheumatoid arthritis
Psoriatic arthritis
Juvenile Idiopathic Arthritis
Lymphedema
Gravitational
Lymphangitis
Venous stasis
Angioedema
Thrombophlebitis
Phlebitis
Purpura