Table 9.

Top 5 keywords of all types related to acupuncture treatment on headache.

Rank	Types of stimulation	Type of headache	Bad incident	Mechanism	Popular attention	Research methods
1	Acupuncture	Migraine	Bleeding/hematoma (6.1%)	Neuromodulation	Efficacy	Randomized controlled trial
2	Electroacupuncture	Tension type headache	Pain (1.7%)	Opioid peptides	Pain	Double blind
3	Sham acupuncture	Chronic headache	Vegetative symptoms (0.7%)	5-HT receptors	Prophylaxis	Clinical trial
4	Auricular acupressure	Cervicogenic headache	Nerve injuries (0.2%)	Neurohormone	Prevalence	Multi-center
5	Acupoint pressure	Cluster headache	Others (0.1%)	Functional connectivity	Quality of life	Placebo