The symptom of pain itself is a particularly common phenomenon in breasts, because there are many penetrating nerves in the breast glands, and when these nerves are stretched and compressed, it is easy to cause pain, and the breast glands change very drastically during breastfeeding, when it has milk filling the glands will be very swollen, and when the milk is discharged the glands will become flaccid. When oxytocin is released, the muscles next to the glandular ducts in the gland contract, so all kinds of stimuli are particularly likely to cause stimulation of the nerves in the breast and cause pain, so the lack of swelling or any tingling is not necessarily a pathological sign, but often a physiological reaction. If these symptoms are persistent or specific, specific to a particular part of the breast, perhaps there is a local inflammation or other local problem, you need to go to the hospital to see.