| http://www.w3.org/ns/prov#value | - terns, not getting enough sleep, or oversleeping.Stress, anxiety, or depression.Medicines, such as heart medicines, blood pressure medicines, and hormones.Poor posture and body mechanics.Smoking cigarettes or cigars, or breathing secondhand smoke.Glare from sunlight or artificial light.Exposure to strong odors.Strain in the muscles of the jaw from grinding or clenching teeth or chewing gum.Herbal
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