Headaches that start in the back of the skull and upper neck; usually spurred (or increase in intensity) by valsalva maneuvers, such as: coughing, sneezing, heaving, laughing, etc.

Positional headache that worsens when upright (sometimes after being upright for a prolonged amount of time) and gain relief when lying down.

Also see: Intracranial Hypotension, CSF Leaks

An extreme sensitivity to light; which can often become painful.