The pain of cluster headaches is remarkably greater than in other headache conditions , including severe migraines ; experts have suggested that it may be the most painful condition known to medical science .
The pain of cluster headaches is remarkably greater than in other headache conditions , including severe migraines . 
 The term '' Headache '' does not convey the severity of the condition ; experts have suggested that it may be the most painful condition known to medical science .