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dehydration → Causes → headache	0.62
uncorrected astigmatism (subgroup of astigmatism) → Causes → headache	0.59
flu → Causes → headache	0.56
stress → Causes → headache	0.55
inhalation → Causes → headache	0.55
grinding → Causes → headache	0.55
aspartame → Causes → headache	0.54
glare → Causes → headache	0.53
anxiety → Causes → headache	0.52
caffeine → Causes → headache	0.52
person → HasA → headache	0.52
distress → HasSubevent → headache	0.51
msg → Causes → headache	0.50
concussion → Causes → headache	0.50
toxin → Causes → headache	0.48
dengue → Causes → headache	0.48
condition → Causes → headache	0.47
turmeric → UsedFor → headache	0.47
allergy → Causes → headache	0.46
toluene → Causes → headache	0.46
sinusitis → Causes → headache	0.46
tension → Causes → headache	0.45
sleep apnea → Causes → headache	0.45
eating → Causes → headache	0.44
brain → Causes → headache	0.43
chemical → Causes → headache	0.43
anemia → Causes → headache	0.43
hormone → Causes → headache	0.43
breathing → Causes → headache	0.42
drug → Causes → headache	0.42
lack → Causes → headache	0.41
alcohol → Causes → headache	0.41
child (aspect of parent) → HasA → headache	0.40
body → Causes → headache	0.40
vaccine → Causes → headache	0.40
chronic stress (subgroup of stress) → HasSubevent → headache	0.40
formaldehyde → Causes → headache	0.40
carbon monoxide → Causes → headache	0.40
cold → Causes → headache	0.39
problem → Causes → headache	0.39
caffeine (aspect of tea) → Causes → headache	0.39
mother → HasA → headache	0.39
adult → HasA → headache	0.38
depression → Causes → headache	0.38
medicine → Causes → headache	0.38
withdrawal → Causes → headache	0.38
ginseng → Causes → headache	0.37
mold → Causes → headache	0.37
poisoning → Causes → headache	0.37
subject → HasA → headache	0.36
valerian → Causes → headache	0.36
gas → Causes → headache	0.36
caffeine (aspect of coffee) → Causes → headache	0.36
eye → Causes → headache	0.35
food → Causes → headache	0.35
odor → Causes → headache	0.34
sleep deprivation → Causes → headache	0.34
sugar → Causes → headache	0.34
chickenpox → Causes → headache	0.33
central nervous system → Causes → headache	0.33
head → Causes → headache	0.33
lead poisoning → Causes → headache	0.33
tumor → Causes → headache	0.32
hypoglycemia → Causes → headache	0.32
lupus → Causes → headache	0.32
working → Causes → headache	0.31
shoulder → Causes → headache	0.31
ozone → Causes → headache	0.31
diet → Causes → headache	0.31
nervous system → Causes → headache	0.31
melatonin → Causes → headache	0.31
shingle → Causes → headache	0.31
coffee → Causes → headache	0.31
viagra → Causes → headache	0.30
certain food (subgroup of food) → Causes → headache	0.30
young child (subgroup of child) → HasA → headache	0.29
insomnia → Causes → headache	0.29
acetaldehyde → Causes → headache	0.29
reading → Causes → headache	0.29
brucellosis → Causes → headache	0.29
bite (aspect of spider) → Causes → headache	0.28
drink → Causes → headache	0.28
herb → UsedFor → headache	0.28
carbon dioxide → Causes → headache	0.27
joint → Causes → headache	0.27
use → Causes → headache	0.26
acetone → Causes → headache	0.26
antihistamine → Causes → headache	0.26
tularemia → Causes → headache	0.26
irritation → Causes → headache	0.25
glass → Causes → headache	0.25
dill → UsedFor → headache	0.25
client (aspect of therapist) → HasA → headache	0.25
vitamin d → HasSubevent → headache	0.25
salmonella → Causes → headache	0.25
lead → Causes → headache	0.25
artery → Causes → headache	0.24
concentration → Causes → headache	0.24
lyme disease (subgroup of disease) → Causes → headache	0.24
oxygen → Causes → headache	0.24
mercury → Causes → headache	0.24
bite → Causes → headache	0.24
arthritis → Causes → headache	0.23
nose → Causes → headache	0.23
vitamin c → Causes → headache	0.23
degree → Causes → headache	0.22
clogged drain (subgroup of drain) → IsA → headache	0.22
calcium → HasSubevent → headache	0.22
screen → Causes → headache	0.22
level → Causes → headache	0.21
pillow → Causes → headache	0.21
ethanol → Causes → headache	0.21
tooth → Causes → headache	0.21
burning → Causes → headache	0.20
benzene → Causes → headache	0.20
pollution → HasSubevent → headache	0.20
abuse → Causes → headache	0.19
chlorine → Causes → headache	0.19
monitor → Causes → headache	0.19
pathogen → Causes → headache	0.19
fungus → Causes → headache	0.19
methane → Causes → headache	0.19
nicotine → Causes → headache	0.18
compound → Causes → headache	0.16
alteration → Causes → headache	0.16
ammonia → Causes → headache	0.16
arsenic → Causes → headache	0.16
chewing gum → Causes → headache	0.16
combination → Causes → headache	0.16
diabetes → Causes → headache	0.16
disturbance → Causes → headache	0.16
drop → HasSubevent → headache	0.16
elimination → HasSubevent → headache	0.16
erythromycin → Causes → headache	0.16
failing → HasSubevent → headache	0.16
fluid → Causes → headache	0.16
fluoxetine → Causes → headache	0.16
glaucoma → Causes → headache	0.16
hit → HasSubevent → headache	0.16
homework → HasSubevent → headache	0.16
lavender → Causes → headache	0.16
ligament → Causes → headache	0.16
microwave → Causes → headache	0.16
nitrate → Causes → headache	0.16
pothole → Causes → headache	0.16
tissue → Causes → headache	0.16
ultrasound → Causes → headache	0.16
zinc → Causes → headache	0.16
black mold (subgroup of mold) → Causes → headache	0.16
infected person (subgroup of person) → HasA → headache	0.16
emotional stress (subgroup of stress) → HasSubevent → headache	0.16
bad tenant (subgroup of tenant) → Causes → headache	0.16
spore (aspect of mold) → Causes → headache	0.16
sleep (aspect of sleep apnea) → Causes → headache	0.16
weight → Causes → headache	0.15