Lymphedema can be classified as temporary or chronic. Temporary lymphedema lasts less than six months. Potential causes of temporary lymphedema include:

• A surgical drain that leaks protein-rich fluid into the tissue at a surgical site
• Inflammation
• An inability to move a limb
• A temporary loss of lymphatic function such as with an infection
• A blocked vein caused by a blood clot or inflammation
• Injury that damages lymph nodes or lymph vessels
  

Chronic lymphedema is a long-term condition. Potential causes of chronic lymphedema include:

• Radiation therapy
• Surgical removal of the lymph nodes and lymph vessels
• A recurrence or spread of a tumor to the lymph nodes
• An infection of and/or injury to the lymph vessels
• Not being able to move the limbs for a period of time
• A failure to control the early signs of lymphedema
• A blocked vein caused by a blood clot