Why does air pressure never cause problems?

Dear Tom,
Why does air pressure never cause problems?
— Vince Pamelo
Dear Vince,
Air pressure, a measure of the weight of air, is determined by the amount of air extending upward to the top of the atmosphere. A barometer measures the number of inches of mercury (in a vertical tube) that weigh exactly the same amount as the air pressure. The average air pressure at sea level is 29.92 inches of mercury, or about 14.7 pounds per square inch.
Air pressure is a benign weather phenomenon in the sense that its effects on the human body are minor within the limits that air pressure varies (below about 12,000 feet). Chicago’s air pressure extremes are 30.98 inches (Feb. 16, 1989) and 28.70 inches (March 12, 1923). The difference, 2.28 inches, represents only about one pound per square inch, or an elevation change of 2,160 feet.
Air pressure is a benign weather phenomenon in the sense that its effects on the human body are minor within the limits that air pressure varies.