"<p>If the headache persists for several days, go to a trusted eye doctor and ask him or her to do the necessary tests on you; only then go to an internist.</p> <p>Ordinary, everyday headaches are most often caused by nicotine; then by the weather, atmospheric pressure, and temperature changes on days of frontal migration; less often by some dietary fault; and still less often by circulatory disorders. But it can also be caused by nervousness, cowardice, or fear of tasks or situations. For a cold sore, I can recommend the following: drink a cup of hot, strong black tea, darken the room, lie in bed, swallow an algocratine or two, warm your aching skull with a hot electric blanket, and lie still for an hour or two. This method is infallible, and it cures the simple spasm of the blood vessels, the migraine, without fail. For all other types of headaches, consult an ophthalmologist and an internist immediately.</p>"