When will a nipples get erected?

Nipples may become erect due to various reasons:

1. Physiological:

- Cold Temperatures: Exposure to cold temperatures can cause vasoconstriction, leading to increased blood flow to the nipples, which can result in erection.

- Hormonal Changes: During certain stages of the menstrual cycle,特别是排卵期，性激素水平的波动会导致乳房和乳头的敏感度增加，并诱发勃起。

- Excitation: Sexual stimulation or arousal can cause the release of hormones and neurotransmitters that lead to increased blood flow and erection of the nipples.

- Pregnancy: Hormonal changes during pregnancy can make the breasts and nipples more sensitive and prone to erection.

2. Pathological:

- Certain medical conditions, such as Paget's disease of the nipple or breast cancer, can cause nipple erection that is not associated with sexual arousal.

It's important to note that the occasional erection of nipples without sexual stimulation is generally not a cause for concern. However, if the erection is persistent or associated with other concerning symptoms, it's advisable to consult a healthcare professional to rule out any underlying medical conditions.