Headache on the left side may cause generalized aching or pain in a specific place, such as behind the left eye. It may feel throbbing ... It usually occurs in people over 50 years of age.

But even if you’re a headache veteran who's able to tough out even the most debilitating episodes, there are a few critical ...

Table 1. Causes of Headache and Third-Order Horner's Syndrome Dr. Jurkunas is affiliated with the department of cornea and external disease, Massachusetts Eye and Ear Infirmary, Boston ...