In a cluster headache, which associated symptoms are commonly observed?

• A. Nausea and vomiting
• B. Photophobia and phonophobia
• C. Lacrimation and nasal congestion
• D. Focal neurologic deficits

Answer: (C)

In cluster headaches, the associated symptoms that are prominently observed include lacrimation and nasal congestion. Cluster headaches are characterized by excruciating unilateral pain, often around the eye or temple, and they usually occur in cyclical patterns or "clusters." Alongside the intense pain, autonomic symptoms such as tearing (lacrimation) and nasal stuffiness or runny nose (nasal congestion) are commonly present on the same side as the headache.

The reason these symptoms occur is related to the trigeminal nerve's involvement in the pathways of pain perception and the associated autonomic nervous system responses. The pain of cluster headaches is typically severe and is often described as a "piercing" or "stabbing" sensation, and these accompanying symptoms greatly aid in distinguishing cluster headaches from other types of headaches.

While nausea and vomiting, photophobia, and phonophobia can be associated with other headaches, particularly migraines, they are not characteristic of cluster headaches. Additionally, focal neurologic deficits are not typical in cluster headaches, as they do not usually present with these symptoms. Thus, the presence of lacrimation and nasal congestion is a clear and defining characteristic of cluster headaches.