Common causes of headaches include: stress, tension, anxiety, allergies, constipation, coffee consumption, eyestrain, hunger, sinus pressure, muscle tension, hormonal imbalances, temporomandibular join (TMJ) syndrome, trauma to the head, nutritional deficiencies, the use of alcohol, drugs or tobacco, fever, as well as exposure to irritants such as pollution, perfume, or after-shave lotion. The brain itself is insensitive to pain.
Most probably, the pain of headaches is due to dilatation of the arteries or to pressure of some sort. The dilatation may be in response to nervous stimuli, or the pain may arise from the neck muscles, or scalp, or from other nearby organs.
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