Chronic migraine develops over time due to a number of factors:
- The number of episodic headaches steadily increases over time.
- Medications once used to treat episodes of headache become overused in an attempt to keep the increased number of headaches under control.
Other factors associated with chronic migraine include:
- Mood disorders, especially anxiety and depression
- Ongoing disrupted sleep pattern
- Excessive caffeine intake
- History of severe emotional (stressful life events) or physical trauma.