👉 Nebulising is a medical condition that refers to a condition in which blood vessels dilate, or expand, and increase in size. This can occur during pregnancy when the mother's blood vessels are expanding to accommodate the increased blood flow to the placenta. The exact cause of nebulising is not fully understood, but it may be caused by hormonal changes, as well as other factors such as stress or infection. Nebulising can lead to bleeding and should always be monitored closely during pregnancy