Primary exercise headaches These headaches: 
Are usually described as throbbing
Occur during or after strenuous exercise
Affect both sides of the head in most cases
 Secondary exercise headaches These headaches may cause: 
The same symptoms as primary exercise headaches
Vomiting
Loss of consciousness
Double vision
Neck stiffness
 Primary exercise headaches typically last between five minutes and 48 hours, while secondary exercise headaches usually last at least a day and sometimes linger for several days or longer.