question:  From the passage, what is said to be the most common complaint of man?
context: Why, having a head, of course! No one knew whether his Theory of Spatium was correct or not because no one had yet been able to frame an argument with it. The government took up a lot of his time using him as the symbol of the Ideal Scientist to help recruit Science and Engineering Cadets. Despite his impressive body, some years before he had suffered a mild stroke ... or at least a vascular spasm of a cerebral artery. "He's always treated me like dirt," Ferris said heatedly. "Actually, Doctor, we haven't the right to ask this of a man of your importance. "Doctor, we understand you have severe headaches," Mitchell said. "Doctor," Mitchell said, "what would you say the most common complaint of man is?" "I would have said the common cold," Macklin replied, "but I suppose from what you have said you mean headaches." "Everybody has them at some time in his life. "Aspirins would still be used to reduce fever and relieve muscular pains," Mitchell said. "There are a number of different causes for headaches—nervous strain, fatigue, physical diseases from kidney complaints to tumors, over-indulgence—but there is one effect of all of this, the one real cause of headaches," Mitchell announced. "That is, the constriction of blood vessels in the telencephalon section of the frontal lobes. It's caused by an over-production of the pituitary gland. A colony of virus in the brain cells will relax the cerebral vessels—and only the cerebral vessels—so that the cerebrospinal fluid doesn't create pressure in the cavities of the brain." "On rats, on chimps...." Conscientious objectors from the Army." Unless we can produce quick, conclusive and dramatic proof of our studies we can get no more financial backing. When I start making slips like that it means another attack of migraine. "When your heart stops, your blood pressure goes to its lowest point," Mitchell said.
output:  headaches
options:  sinus infections  headaches  The common cold  lack of sleep