The reason why the chest suddenly becomes smaller may be several situations: 1, underwear is too tight, the breasts in a long-term squeezed state may lead to breast breasts become smaller, so you need to often change underwear, wear the right underwear is beneficial to the development of the chest. 2, malnutrition, long-term nutritional intake is insufficient, the overall state of lack of nutrition, the body will be thin followed by the chest may also become smaller. This is because of the fact that the woman can’t diet excessively to lose weight, which may lead to a decrease in body resistance and smaller breasts. 3, drugs, if you often take birth control pills, may cause endocrine disorders, resulting in hormone level disorders, which will also cause smaller breasts, so you can’t abuse drugs, after all, drugs are three kinds of poison. 4, caffeine, often drink coffee may also cause smaller breasts, because caffeine can be with the female body of a certain The reason is that caffeine can have an effect with certain genes in a woman’s body, causing her breasts to become smaller.