How often do attacks of Cluster Headaches occur
An “attack” is a single attack of pain, and a bout is a series or “cluster” of attacks. In the absence of preventive medications, episodic CH is characterized by bouts lasting 7 days to 1 year separated by remission periods lasting 1 month or longer.
Chronic CH is the absence of remission for 1 year or remissions of less than 1 month. Ten percent of CH is the chronic type.
Chronic CH may either be chronic from onset or may evolve from the episodic type.
Most people have one bout per year, with a mean bout duration of 8.6 weeks. Some patients can go years without a bout, and others have frequent bouts each year.
