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, sharp, or piercing. Most people will experience a headache ...

Migraines: These are severe headaches often accompanied by nausea ... a certain pressure or even pain only on either the left ...

severe headaches. They cause pounding, pulsating, and throbbing pain that usually starts on one side of the head and can make its way toward the back of the head and neck or behind the eyes.

severe headache with chest pain, sudden vision problems or confusion and difficulty speaking or numbness on one side of the body.