A study of 50 healthy nurses from the University Hospital showed that 72% had chronic headache. Among those who had chronic headache, 33% were due to migraine. Another 30% were probable migraine subjects and 33% suffered from tension headache. Twenty two nurses had headache more than once a month and 18 nurses described the headache as moderate to severe. The common precipitating factors mentioned were tension, exposure to the sun, lack of sleep and menstruation.