Headaches are very common, but definitely not normal for the human body!
A large study showed a staggering 38% prevalence of tension-type headaches in the general population over a one year period.
Of those affected, 8.3% lost workdays because of their headaches and 43.6% reported decreased effectiveness at work, home or school.
The cost spent annually for lost productivity and treatment is estimated to be in the billions of dollars!
Dozens of sub-classes of headaches have been identified, but in general the most common types are: