Harvard Health Blog
Thunderclap headache: The "worst headache of my life"
By: Aneesh Singhal, MD, Contributor Not all headache disorders are the same. An excruciating, sudden-onset headache known as thunderclap headache (TCH) is a medical emergency, very different from more common headache disorders such as migraine and tension headache. If you develop TCH, you should call 911 or immediately go to the closest hospital.