Overview
Primary lymphedema is a long-term condition where the lymphatic system — a network of vessels and nodes that helps drain fluid from body tissues — does not work properly from birth or develops problems early in life. Unlike secondary lymphedema, which is caused by damage to the lymphatic system (such as from cancer treatment or infection), primary lymphedema is caused by the lymphatic system being abnormally formed or underdeveloped. This leads to a buildup of protein-rich fluid in the tissues, most often in the arms or legs, causing swelling that can range from mild to severe. The most common symptom is persistent swelling, usually starting in the feet and lower legs, though it can affect the arms, face, or genitals. The skin over the swollen area may feel tight, heavy, or ache. Over time, the skin can become thickened and hardened, a process called fibrosis. People may also experience repeated skin infections called cellulitis, which can worsen the condition. Primary lymphedema is also known as hereditary lymphedema or congenital lymphedema, depending on when it appears. There is currently no cure, but treatment can greatly improve quality of life. The main treatments include compression garments, specialized massage called manual lymphatic drainage, exercise, and careful skin care. These approaches are grouped together as complete decongestive therapy. Some people may benefit from surgical options in more severe cases. With good management, many people with primary lymphedema live full and active lives.
Key symptoms:
Persistent swelling in one or both legs, feet, arms, or handsFeeling of heaviness or tightness in the affected limbAching or discomfort in the swollen areaSkin that feels firm or hard over timeThickened or warty skin changes in long-standing casesRepeated skin infections (cellulitis) in the swollen areaDifficulty fitting into shoes or clothing due to swellingReduced range of movement in the affected limbSwelling that gets worse with heat, prolonged standing, or activityIn some forms, extra eyelashes growing inward (distichiasis)Swelling of the face or genitals in some casesFluid leaking through the skin in severe cases
Variable
Can be inherited in different ways depending on the underlying gene
Variable
Can begin at different ages, from infancy through adulthood
FDA & Trial Timeline
3 eventsATI Holdings, LLC
University Hospital, Toulouse — NA
Gangnam Severance Hospital — NA
Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.
Treatments
No FDA-approved treatments are currently listed for Primary lymphedema.
3 clinical trialsare actively recruiting — trials can provide access to cutting-edge therapies.
View clinical trials →Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
Travel Grants
No travel grants are currently matched to Primary lymphedema.
Community
No community posts yet. Be the first to share your experience with Primary lymphedema.
Start the conversation →Latest news about Primary lymphedema
Disease timeline:
New recruiting trial: Primary Surgical Prevention of Breast Cancer-related Lymphedema
A new clinical trial is recruiting patients for Primary lymphedema
New recruiting trial: Study of Lymphatic Dysfunction in Primary and Secondary Lymphedema
A new clinical trial is recruiting patients for Primary lymphedema
Caregiver Resources
NORD Caregiver Resources
Support, advocacy, and financial assistance for caregivers of rare disease patients.
Mental Health Support
Rare disease caregiving can be isolating. Connect with counseling and peer support.
Family & Caregiver Grants
Financial assistance programs specifically for caregivers of rare disease patients.
Social Security Disability
Learn how rare disease patients may qualify for SSDI/SSI benefits.
Questions for your doctor
Bring these to your next appointment
- Q1.Which type of primary lymphedema do I have, and has a genetic cause been identified?,Should my family members be tested for the same genetic change?,What is the best compression garment for my situation, and how often do I need to replace it?,How do I recognize a skin infection early, and what should I do if I think I have one?,Are there any surgical treatments that might help me, and would I be a candidate?,Are there any clinical trials or new treatments I should know about?,What exercises or activities are safe for me, and which ones should I avoid?
Common questions about Primary lymphedema
What is Primary lymphedema?
Primary lymphedema is a long-term condition where the lymphatic system — a network of vessels and nodes that helps drain fluid from body tissues — does not work properly from birth or develops problems early in life. Unlike secondary lymphedema, which is caused by damage to the lymphatic system (such as from cancer treatment or infection), primary lymphedema is caused by the lymphatic system being abnormally formed or underdeveloped. This leads to a buildup of protein-rich fluid in the tissues, most often in the arms or legs, causing swelling that can range from mild to severe. The most commo
Are there clinical trials for Primary lymphedema?
Yes — 3 recruiting clinical trials are currently listed for Primary lymphedema on UniteRare. See the clinical trials section on this page for phase, sponsor, and site details sourced from ClinicalTrials.gov.
Which specialists treat Primary lymphedema?
25 specialists and care centers treating Primary lymphedema are listed on UniteRare, sourced from ClinicalTrials.gov principal investigators, published research, and the NPPES NPI registry.