Tips for preventing headaches:
Medicine may be needed to prevent headaches.
Krusz JC. Tension-type headaches: what they are and how to treat them. Prim Care. June 1, 2004; 31(2): 293-311, vi.
Goetz, CG. Textbook of Clinical Neurology. 2nd ed. St. Louis, Mo: WB Saunders; 2003: 1187-1194.