Diagnosis of a clinical entity like pregnancy associated breast cancer (PABC) is as demanding and challenging as its rarity. Increasing incidence and controversy that exists in the literature upon prognosis, tumor aggressiveness and underlying mechanisms, highlight the importance of optimizing the diagnostic strategy in women with PABC. Adjustment of standard approach for breast cancer by modifying management methods and options plays key role in decision making. Knowledge of diagnostic modalities and their limitations, in accordance with awareness of physiologic hormone-induced changes of pregnancy and lactation, is the fundamental method of diagnosis in PABC. Thorough triple assessment (history/clinical examination, imaging and cytology/histology) enforces healthcare providers with all essential tools to avoid detrimental delay in diagnosis and to confront with their own hesitation to take action due to limited experience of the disease.