It can be hard to explain to friends and family how bad headaches can make you feel, and how much they affect your daily life. Whether they make you cancel your plans, give up activities or use up sick days at work, a headache can be a real, excuse the pun, pain! You may not realize just how strongly your migraines and headaches are affecting your quality of life until you do an evaluation. Think back to events you may have missed or your last sick day, and it may all become clear. If you keep a headache diary, everything will fall into place just by glancing at dates and making the link between headaches and cancelled plans.