What causes lipedema?

Yes — family history is one of the strongest risk factors. Studies find that approximately 60% of people with lipedema report at least one affected relative, and registry data suggests the figure may be as high as 94%. (Herbst et al. Phlebology 2021)

The inheritance pattern is thought to be autosomal dominant with sex limitation — meaning one copy of a variant gene is enough to pass on susceptibility, but the condition almost only manifests in people with female-pattern hormone profiles. Researchers have identified several candidate genes, including AKR1C1 and AKR1C2 (involved in steroid hormone metabolism) and variants near the VEGFA gene (involved in blood vessel growth). (Aday et al. 2024)

Female sex hormones — particularly estrogen — appear to be a key driver. Lipedema almost never appears before puberty, and it characteristically starts or worsens at hormonal turning points: puberty, pregnancy, and menopause. This timing strongly implicates estrogen-receptor signaling in triggering or accelerating fat accumulation in susceptible tissue. (Herbst et al. 2021)

• Puberty: the most common time for lipedema to first appear
• Pregnancy: many women report a marked worsening during or after pregnancy
• Menopause: hormonal shifts can trigger progression
• Hormonal contraceptives or HRT: some women notice changes, though the association is observational and stopping these medications is not advised without medical guidance

Lipedema fat is not simply "more fat." At the cellular level, research shows several abnormal processes at work:

• Fibrosis: abnormal collagen deposits stiffen the fat tissue over time, contributing to the nodular texture
• Chronic inflammation: inflammatory cells accumulate in lipedema fat, causing pain and tenderness
• Microvascular fragility: capillaries in lipedema tissue are unusually fragile, explaining the easy bruising
• Impaired lymphatic drainage: the lymphatic system in affected areas becomes less efficient, contributing to swelling and, over time, lipo-lymphedema
• Adipocyte hyperplasia: an increase in the actual number of fat cells, not just their size — this is why the tissue resists fat-burning

These changes help explain why lipedema fat cannot be lost through calorie restriction alone: the tissue has a different biology from ordinary adipose tissue.

Male lipedema is rare but documented. In men, it is almost always associated with conditions that alter hormone balance — low testosterone (hypogonadism), liver cirrhosis, or treatment with estrogen-modulating medications. If a man presents with symmetric, painful leg fat, both lipedema and hormonal causes should be evaluated. (Herbst et al. 2021)

Lipedema research has accelerated in recent years. A 2025 genome-wide association study identified new genetic loci associated with lipedema susceptibility, pointing toward pathways in steroid metabolism and vascular development. Researchers are investigating whether lipedema has an autoimmune component and whether the fibrosis and inflammation can be targeted pharmacologically. (Herbst et al. 2021)