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Abstract Lipedema is a wide-spread disease with painful accumulations of subcutaneous fat in legs and arms. Often obesity co-occurs. Many patients suffer from impairment in mobility and mental health. Obesity and mental health in turn can be positively influenced by physical activity. In this study we aimed to examine the interrelations between pain and physical activity on mental health in lipedema patients. In total, 511 female lipedema patients (age M = 40.16 ± 12.45 years, BMI M = 33.86 ± 7.80 kg/m 2 ) filled in questionnaires measuring pain (10-point scale), physical activity (7 Items; units per week), and mental health (PHQ-9; WHOQOL-BREF with subscales mental, physical, social, environmental, and overall health). Response surface analyses were calculated via R statistics. Explained variance was high for the model predicting depression severity (R 2  = .18, p < .001) and physical health (R 2  = .30, p < .001). Additive incongruence effects of pain and physical activity on depression severity, mental, physical, and overall health were found (all p < .001). In our study, physical activity and pain synergistically influenced physical, mental, and overall health. Pain did not only lead to low mental health but also interfered with the valuable potential of engaging in physical activity in lipedema patients.