The growth of breast cysts after removal may be caused by trauma, bad mood, and excessive estrogen level in food. 1. Trauma: If a breast cyst suffers trauma after removal, it will cause local bleeding and form a hematoma, resulting in the growth of the removed breast cyst. 2. bad mood: breast cyst patients even after the removal of breast cysts, but also to maintain a good mood, because bad mood will lead to endocrine disorders, resulting in excessive secretion of estrogen, triggering the regrowth of breast cysts. 3. Excessive level of estrogen in food intake: If you often intake food with high estrogen level after breast cyst removal, it will lead to high estrogen level in the body, which will easily make the resected breast tumor grow again. When the breast tumor grows again after excision, it is recommended to consult a doctor in time, so that the doctor can formulate a treatment plan according to the actual situation of the body.