Seventy-six percent of patients with daily headaches were found to have a history of episodic migraine in the past, more than half of them hormone dependent headache such as menstrual migraine. Various factors possibly influencing the transformation of episodic migraine into daily headaches were analyzed in a series of 61 patients who presented with daily headaches. Abnormal personality profile, especially neuroticism including depression, excessive stress, excessive use of medications such as caffeine containing analgesics, narcotic analgesics and ergotamine, and development of hypertension were found to be significant in the transformation of episodic migraine into daily headache.The problem of daily headache is discussed. It is suggested that the majority of daily headaches are a continuum of episodic migraine, influenced and perpetuated by various factors such as neuroticism, excessive medication, stress, and development of hypertension. It is pointed out that diagnosis of tension headache under those circumstances is not justified. (Headache 22:66-68, 1982)