Tension headaches are probably caused by tight muscles in the shoulders, neck, scalp, and jaw.v Often, they are related to stress, irregular meals, poor posture, inadequate sleep, or anxiety.
Migraine headaches are thought to result from abnormal function of the brain's blood vessels or vascular system.vi They are often provoked by certain activities, foods, or behaviors, referred to as 'triggers' in susceptible individuals. The most common triggers are alterations in sleep patterns, stressors in everyday life, menstrual periods in women, irregular meals, changes in weather, and travel.vii
Some foods and additives may contribute to the development of a migraine headache.x These include:
Other causes of headaches include:
Loder E, Rizzoli P
BMJ 2008; 336:88-92
viMigraine and cardiovascular disease
Bigal ME, Kurth T, Hu H, Santello N, Lipton RB
Neurology 2009; 72: 1864-1871
viiThe triggers or precipitants of the acute migraine attack.
xDiagnosing and Managing Migraine Headache
JAOA 2007; 107(11) ES10-16