Symptoms
Thunderclap headaches are dramatic. Symptoms include pain that:
- Strikes suddenly and severely
- Peaks within 60 seconds
- Can be accompanied by nausea or vomiting
Thunderclap headaches might be accompanied by other signs and symptoms, such as:
- Altered mental state
- Fever
- Seizures
These signs and symptoms might reflect the underlying cause.
When to see a doctor
Seek immediate medical attention for any headache that comes on suddenly and severely.
Source: http://www.mayoclinic.com