03/02/2026
Lymphedema is a condition characterized by swelling due to the accumulation of lymphatic fluid in localized tissues, typically caused by impaired lymph flow. While lymphedema can affect any part of the body, it most commonly occurs in the arms, legs, or face. The condition is generally classified into two types: primary lymphedema and secondary lymphedema.
Primary Lymphedema
Primary lymphedema is usually the result of developmental abnormalities in the lymphatic system, often with a genetic origin. Possible causes include:
Genetic Defects: Some individuals are born with underdeveloped or malformed lymphatic vessels, which leads to impaired lymphatic drainage. This type of lymphedema may present at birth or during childhood.
Lymphedema–Distichiasis Syndrome: A rare hereditary disorder characterized by lymphedema accompanied by an abnormal second row of eyelashes (distichiasis).
Secondary Lymphedema (Acquired)
Secondary lymphedema is caused by external factors that obstruct lymph flow. Common causes include:
Surgical Treatments:
In cancer treatment, lymph nodes or lymphatic vessels may need to be removed, which can interfere with lymph drainage and lead to swelling. This is particularly common in treatments for breast, prostate, and uterine cancers where lymph node dissection is often necessary.
Radiation Therapy:
Radiation can damage or scar lymph nodes and vessels, disrupting normal lymph flow and resulting in localized swelling.
Infections:
Severe bacterial infections—such as schistosomiasis or filariasis—can cause inflammation or damage to lymph nodes, impairing the function of the lymphatic system and leading to fluid buildup.
Trauma or Post-Surgical Complications:
Injuries such as burns or surgical incisions can damage lymphatic vessels and result in swelling in the affected area.
Chronic Diseases:
Certain chronic conditions—such as congestive heart failure, liver cirrhosis, or kidney disease—can lead to systemic fluid retention, which may trigger or worsen lymphedema.
Obesity:
Severe obesity significantly increases the risk of lymphedema. Excess adipose tissue may compress lymphatic vessels, hindering proper lymph flow.
Inflammatory Diseases:
Chronic inflammatory disorders or immune system dysfunctions, such as rheumatoid arthritis and systemic lupus erythematosus, can interfere with lymphatic circulation and increase the risk of swelling.
