Which condition can be a cause of epistaxis?

Epistaxis, or nosebleeds, can occur due to various reasons, one of which is trauma, such as a nose or facial fracture. When a fracture occurs in the nasal area, it can damage the blood vessels that are responsible for supplying blood to the nasal mucosa, leading to bleeding. This type of trauma can cause immediate bleeding, as well as increased susceptibility to subsequent nosebleeds due to structural instability or damage to the nasal passages.

Other conditions can also lead to epistaxis, but they generally involve different mechanisms. Viral infections, while they may irritate the nasal mucosa and lead to congestion, are not solely responsible for causing epistaxis. Dental infections and allergies can contribute to nasal irritation or congestion but are less directly associated with the physical trauma required to cause substantial bleeding as seen in a fracture.