When evaluating dizziness, which red flag symptom is commonly associated with Subarachnoid Hemorrhage (SAH)?

Thunderclap headache is often recognized as a key "red flag" symptom associated with Subarachnoid Hemorrhage (SAH). This type of headache is characterized by its sudden onset and intensity, often described by patients as the worst headache they have ever experienced. It can occur without warning and reaches peak intensity within moments, setting it apart from other types of headaches that may have a more gradual onset or develop over time.

In the context of SAH, this abrupt and severe headache results from the sudden release of blood into the subarachnoid space, which irritates the meninges and surrounding brain tissue, leading to a significant pain response. Recognizing this symptom is crucial for healthcare providers, as it can facilitate timely diagnosis and treatment of SAH, which is a life-threatening condition.

While other symptoms such as gradual onset headaches, vision changes, and nausea can occur in various medical conditions, they do not specifically indicate SAH as clearly as a thunderclap headache does. Therefore, identifying a thunderclap headache is critical in differentiating SAH from other causes of dizziness or headache, allowing for appropriate medical intervention.