My friend complains about having severe headache at times, may be 5 times in a month and the pain is unbearable to her. what could this possibly be ?

Possibly migraines: Migraine headache is quite common and your friend could possibly be suffering from it. It is often quite severe and may worsen over time. She should see a doc for an evaluation, esecially if this is a new headache or if it is rapidly worsening. Excedrine migraine may help some people minimize the symptoms..But she may need preventive treatment. Wish her some luck for me..

Exam and history: Too vague a question without having a thorough history and an examination. Too many variables when attempting to determine the cause of a headache.