Objective Socioeconomic inequalities in recognising signs and symptoms of cancer may result in inequalities in timely help‐seeking and subsequent prognosis of breast cancer. We explored the mediating role of symptom attribution and concern on the relationship between level of education and help‐seeking for potential breast cancer symptoms. Methods Women aged ≥47 years (n = 961) were purposively recruited (by education) to complete an online vignette‐based survey that included nipple rash and axillary lump (in separate vignettes) as potential symptoms of breast cancer. Women completed questions relating to medical help‐seeking (yes/no), cancer attribution, symptom concern, cancer avoidance, family history, and demographics. Results Women with low education and mid education attributed nipple rash less often to cancer (26% and 27% mentioned cancer) than women with a degree or higher (40%). However, women with a degree or higher (63%) or mid education (64%) were less likely to anticipate seeking help for the nipple rash than women with no formal qualifications (73%). This association was statistically significant in the 60‐ to 69‐year‐old age group. There was no significant association between education and help‐seeking for axillary lump. Mediation analysis adjusting for potential confounders confirmed that the association between education and help‐seeking for nipple rash was fully mediated by symptom concern. Conclusions Socioeconomic inequalities in stage at diagnosis and survival of breast cancer may not always be explained by lower likelihood of suspecting cancer and subsequent impact on help‐seeking. Reducing inequalities in stage at diagnosis will involve understanding a broader range of bio‐psycho‐social factors (eg, comorbidities and healthcare system factors).