**Question:** All of the following are types of Primary headache except:

A. Tension headache
B. Migraine
C. Cluster headache
D. Secondary headache

**Core Concept:** Headache is a common symptom in clinical practice, and it can be primary or secondary based on its etiology. Primary headaches are not associated with any underlying disease or cause, while secondary headaches result from an underlying medical condition.

**Why the Correct Answer is Right:** D. Secondary headache is the correct answer because it refers to a headache caused by an underlying medical condition or disease, which is not included in the given options. Primary headaches, like tension headache, migraine, and cluster headache, are the main focus of the question.

**Why Each Wrong Option is Incorrect:**

A. Tension headache is a common primary headache characterized by mild to moderate pain on both sides of the head, often caused by muscle tension and stress. It is not a secondary headache.

B. Migraine is a severe, throbbing headache that usually occurs on one side of the head. It is also a primary headache, not a secondary one.

C. Cluster headache is an intense, unilateral headache that occurs in cycles (clusters) and is also a primary headache. It is not a secondary headache.

**Clinical Pearl / High-Yield Fact:** It is essential for medical students and practitioners to distinguish between primary and secondary headaches, as secondary headaches require a thorough investigation and management by a healthcare professional. Primary headaches are usually self-limiting and managed conservatively, while secondary headaches may indicate a life-threatening condition and require immediate attention and diagnosis.

**Correct Answer:** D. Secondary headache