You may feel pain behind one or both eyes ... Glaucoma causes intense eye pain and a gradual loss of peripheral (side) vision ...

Experiencing a left-sided headache can be distressing but understanding its causes can help ease your concerns Learn from an ...

and a cervicogenic headache may also cause a headache behind one eye. A few different types of headaches cause pain on only one side of your head. You can usually relieve these headaches with over ...