In briefExertional headaches can occur brief dynamic efforts such as running and swimming. They can also stem from static exertion such as weight lifting. Described here are two patients who experienced headaches of sudden onset while waterskiing. The headaches recurred with other forms of exertion. Both patients had normal neurologic examinations and CT scans. After avoiding aggravating activities and taking nonsteroidal anti-Inflammatory medication as necessary, the patients' headaches gradually resolved.