**Question:** M/c causes of epistaxis in 3 years old child:

**Core Concept:** Epistaxis, also known as nosebleed, is a common pediatric emergency presenting in young children. It can be caused by various factors that need to be differentiated for appropriate management.

**Why the Correct Answer is Right:**
The correct answer is **A:** Epistaxis can be caused by **nasal foreign bodies**. In young children, they often put objects into their nose for exploration or play. A foreign body can obstruct blood vessels, leading to epistaxis.

**Why Each Wrong Option is Incorrect:**

Option B: **Nutritional deficiencies** like Vitamin K deficiency are less common in developed countries and are unlikely to present with isolated epistaxis in a 3-year-old child.

Option C: **Trauma** is also not the likely cause in this age group, as children of this age are less likely to cause trauma to their own nose.

Option D: **Anemia** may present with pallor, fatigue, and pallor, but isolated epistaxis in a 3-year-old child is less likely.

**Clinical Pearl / High-Yield Fact:**
- Children under 3 years of age are more prone to epistaxis due to their active exploration and curiosity.

**Correct Answer:** A. Nasal foreign bodies are a common cause of epistaxis in 3 years old child. Early recognition and removal are crucial to prevent complications.