Introduction

Lipedema, a fat issue that mostly affects people assigned female at birth (AFAB), often gets confused with being too heavy or other health issues. Research has shown that genes are associated.¹ If we understand this issue completely, we can find better ways to treat it and make life better for those who have it. Here's what happens in lipedema: Fat builds up a lot, mostly in the legs, thighs, buttocks, and sometimes arms. What makes it stand out from lymphoedema is that the fat shows up on both sides of the body (symmetrical pattern) and doesn't touch the hands and feet. Those with it often experience pain, feeling heavy, and being super sensitive in the affected parts. They bruise and, over time, it's harder to move the limbs.¹

The condition usually has its onset during stages involving drastic hormonal changes, such as puberty, pregnancy, or menopause and it primarily affects people AFAB. Oestrogen is identified as a major contributing factor to the development of this condition.²

11% of people AFAB all over the world, are affected by this condition, but public and medical knowledge about it remains limited.³ It may take years to arrive at an accurate diagnosis. This condition worsens during illness and causes issues such as depression, anxiety, and lipo-lymphedema (a combination of fat and fluid swelling).³ A better understanding of the hereditary nature of this disease will help specialists curate a customised treatment protocol.

Overview of lipedema pathophysiology

Lipedema causes complex changes in connective tissue, fat tissue, and microvasculature.⁴ It is not merely a superficial or cosmetic issue. Compared to normal fat cells, the adipocytes in regions affected by lipedema are frequently larger, more inflammatory, and more resistant to metabolic breakdown. Researchers have also found abnormal extracellular matrix structures and fibrosis (scarring of connective tissue).⁴

Oestrogen is the key contributing hormone that triggers this condition. It affects inflammation, fat storage, and vascular permeability. This explains the symptomatic flare-up during puberty, pregnancy, or menopause.²

The stages of lipedema include:

• Stage 1: Soft fatty deposits in smooth skin
  
• Stage 2: Uneven skin surface with nodules and indentations
  
• Stage 3: Disfiguring fat lobules grow, often causing joint problems
  
• Stage 4: Secondary lymphedema develops, requiring more complex management²

There may be serious psychological repercussions. Pain, disfigurement, and the weight of misdiagnosis cause patients to experience social disengagement, low self-esteem, anxiety, and depression.³

Evidence supporting genetic factors

Lipedema is known for its genetic tendency to run in families. Recent studies have concluded that people AFAB of the same family, such as mothers, sisters, or grandmothers, are commonly affected.¹

A remarkable study examined many families and concluded that lipedema likely has an autosomal dominant pattern with sex limitation.² The gene can be inherited from either parent, but the condition typically expresses in people AFAB—likely due to oestrogenic effects.

While people assigned male at birth (AMAB) can carry the gene, they rarely show symptoms unless another condition, such as a hormonal imbalance, is present. Because familial clustering has been reported in various countries, some clinicians now advocate for routine family history screening in women who present with bilateral lower limb swelling.¹

Research findings on genetic susceptibility

Although heredity is strongly supported by anecdotal and familial evidence, identifying the actual genetic causes has been challenging. Still, recent research is beginning to uncover genetic contributors.

Extensive family research

A study done on the DNA of 31 individuals from nine families affected by lipedema in the year 2024, identified 469 gene variants that could influence protein function.¹ None of the participants shared a single mutation, highlighting genetic diversity, which implies lipedema may arise from multiple genes that vary across families.

Genome-Wide Association Studies (GWAS)

A fat distribution pattern similar to lipedema was identified in 18 genetic loci in a study conducted by the UK Biobank. A different clinical sample confirmed two loci, GRB14-COBLL1 and VEGFA, among these.⁵ These genes reinforce the connection between vascular and fat issues in lipedema by affecting fat metabolism and vascular development.

Gene link for inflammation

Irregularities in body composition, especially in fat-rich regions such as hips and thighs, have been correlated with variations in the IL-6 gene, which is a cytokine associated with inflammation.⁶

From the above findings, it is evident that genetic pathways related to hormone regulation, fat metabolism, inflammation and vascular health contribute to the development of lipedema.

Clinical implications of hereditary patterns

Identifying the genetic basis of lipedema has several important implications.

• Family History Intake: Clinicians should conduct a detailed investigation noting the similar symptoms in relatives and family. They can ask about unexplained leg swelling, pain, or fat buildup. This can aid in identifying at-risk individuals early
• Early Screening: Since this condition is common in people AFAB, girls at the pubertal stage with a family history of lipedema should be monitored with caution²
• Genetic Counseling: Counseling family members regarding the inherent capacity of this condition may actually benefit the individuals, although there are no standardized tests yet⁷
• Customized Care Plans: Awareness of genetic predisposition can avoid further complications by early targeted interventions such as compression therapy, physical therapy, or surgical options
  

Non-hereditary factors that mimic lipedema

It’s crucial to distinguish lipedema from other conditions that may look similar:

• Obesity causes fat accumulation all over the body. Unlike lipedema, it can be managed by diet and weight loss
• Lymphedema mostly involves the limbs which are swollen due to fluid retention. It has a positive Stemmer’s sign (thickening of the skin folds), which is not seen in lipedema⁸
• Dercum’s Disease is characterised by painful fatty lumps (lipomas) and it affects both people AMAB and people AFAB
• Environmental factors such as poor diet, inactivity, or emotional stress can worsen the already existing condition but do not cause the disease

Detailed clinical evaluation, ultrasound imaging, and tests like lymphoscintigraphy to rule out other disorders may help inaccurate diagnosis.⁸

Future directions in genetic research

Active research is expanding our understanding of lipedema’s genetic underpinnings:

• Expanded GWAS studies are being conducted to identify more genetic variations associated with lipedema-specific fat distribution
• Biomarker Discovery through blood tests and metabolic profiling may soon allow for earlier, objective diagnosis
• Functional Studies use computational models and cell cultures to explain the gene behaviour contributing to fat deposition
• Collaborations with lipedema research foundations, geneticists, and international patient registries aid in new discoveries about gene behaviour

Genetic testing along with technological advancements and awareness help in the proper management of this disease.

Summary

Lipedema is a condition associated with abnormal fat deposition in certain areas such as the thighs, buttocks and sometimes the arms. It mostly affects women and is often misdiagnosed as obesity. Oestrogen is the key contributor that triggers this condition. Research has found that this condition has an inherent capacity attributed to many genes and familial involvement. Recent discoveries along with technological advancements and awareness among the common public, may make life easier for those affected by early diagnosis and prompt management.