Chronic cluster headaches occur continuously without any "remission" periods between cycles; there may be "high" and "low" variation in cycles, meaning the frequency and severity of attacks may change without predictability, for a period of time.
Chronic cluster headaches occur continuously without any "remission" periods between cycles. This was for a period of time. There may be "high" and "low" variation in cycles. This was for a period of time. Variation in cycles is meaning the frequency. Severity of attacks may change without predictability. This was for a period of time.