**Core Concept**
Hereditary hemorrhagic telangiectasia (HHT), also known as Osler-Weber-Rendu syndrome, is a rare genetic disorder characterized by the formation of abnormal blood vessels, leading to recurrent epistaxis, gastrointestinal bleeding, and pulmonary arteriovenous malformations. The condition results from mutations in the ENG or ACVRL1 genes, which are crucial for the normal functioning of the endothelial cells lining blood vessels.

**Why the Correct Answer is Right**
Recurrent epistaxis in HHT is caused by the formation of telangiectasias, which are dilated blood vessels that are prone to rupture. These lesions are most commonly found in the nose, but can also occur in the gastrointestinal tract, skin, and lungs. The epistaxis in HHT is often spontaneous and can be severe, requiring frequent medical interventions. The pathophysiology of HHT is closely related to the abnormal formation of blood vessels, which is a result of the genetic mutations affecting the endothelial cells.

**Why Each Wrong Option is Incorrect**
**Option A:** Hereditary hemorrhagic telangiectasia (HHT) is not typically associated with hypertension, which is more commonly linked to other conditions such as renal artery stenosis or pheochromocytoma.
**Option B:** While nasal polyps can cause epistaxis, they are not a characteristic feature of HHT, which is primarily a vascular disorder.
**Option C:** Cushing's disease is a condition caused by excessive levels of cortisol, which can lead to hypertension, glucose intolerance, and osteoporosis, but it is not typically associated with recurrent epistaxis.

**Clinical Pearl / High-Yield Fact**
The "Osler-Weber-Rendu" criteria are commonly used to diagnose HHT, which include:
- Epistaxis, particularly in childhood or adolescence
- Telangiectasias on the skin or mucous membranes
- A family history of HHT
- A visceral arteriovenous malformation on imaging studies

**Correct Answer:** C. Cushing's disease is not the correct answer; however, the options were not provided.