Breasts sometimes feel like pins and needles, which may be a breast disease or other systemic diseases. The details are as follows: 1. Heart problems. If the left breast occasionally visible needle-like pain, may be heart disease, such as sinus arrhythmia, angina pectoris, etc., need to promptly seek medical attention, do cardiac ultrasound to confirm the diagnosis, so as not to delay the disease. 2, mental stimulation. If the mood is extremely volatile, sometimes not only the heart will appear uncomfortable, the breast will also appear needle-like pain, if the pain is very short, not frequent, generally do not need to deal with. 3, breast disease. For example, breast enlargement and mastitis, mainly manifested as menstrual syndrome, will have pins and needles-like pain, which disappears with menstruation and can be left untreated if it is not obvious, and can obviously be treated by a doctor. Breast cancer will also present with painful discomfort in the breast and requires immediate treatment.