Stabbing pain in the left breast may be related to breast hyperplasia, myocardial ischemia and pleurisy.
1. Breast hyperplasia: before menstruation in the menstrual cycle, the ovary secretes the highest level of estrogen, which stimulates the breast tissue to have a hyperplastic reaction, the volume will be enlarged, and the whole breast tissue will be enlarged, and it also produces left side chest pain.
2. Myocardial ischemia: myocardial ischemia will also manifest itself as stabbing pain in the anterior chest, especially the left anterior chest. There is some regularity in the timing and no persistent pain.
3. Pleurisy: the patient will have obvious localized stabbing pain, which is more obvious when taking a deep breath and is accompanied by respiratory restriction.
There may be other reasons such as left chest skin infection, injury and so on. It is recommended to go to the hospital in time.