[header] How to use a headache diary [title] Get a diary. [step] Purchase a journal, notebook, or something similar from an office supply store. If you want, you can also create entry pages on a word processing program and print them off at home. 
Then, put the pages together in a binder to use as a diary. [substeps] Use a diary that is long enough so you can track headaches for 2 to 3 months or more.