Breasts are sometimes a bit fluffy may be due to breast development, improper wearing of underwear, milk stagnation and other reasons. 1. Breast development: Breasts are sometimes a little tingling may be due to the development of the patient’s breasts, in the process of development in the body of estrogen and progesterone levels will gradually increase, so the breasts may be uncomfortable. 2. Improper underwear: Breasts are sometimes a little tingly may be caused by improper underwear, patients who wear too tight underwear, it may cause poor blood circulation, breasts and thus discomfort. 3. Breast milk stagnation: Breast milk stagnation is generally due to over-nutrition, improper feeding, excessive milk secretion and other reasons, long-term may lead to breast numbness, symptoms of numbness. Breasts are sometimes a bit tingly also seen in other causes, it is recommended that patients should go to the hospital in time for relevant examinations, according to the different causes and then do the treatment.