In a new study, a team examined the medical records of seven thousand hospital patients. The patients had visited the emergency room at Beth Israel Deaconess Medical Center in Boston, Massachusetts, because of a headache. More than two thousand of them had been found to have a migraine.

　　The team then compared those records to weather conditions in the twenty-four hours before the hospital visits. For every increase of five degrees centigrade in air temperature, the patients had a seven and one-half percent higher risk of migraine. Decreases in barometric pressure two to three days before the visit also appeared to trigger headaches.

　　The researchers found no evidence that air pollution influenced headaches. But they could not rule out the possibility of a smaller effect.

　　A separate study has found that age, gender and where a person has extra body fat my affect the risk of migraine. It found that overweight people between the ages twenty and fifty-five may have a higher risk. On average, those who were larger around the middle were more likely to have migraines than those of the same age with smaller waistlines.

　　The study involved twenty-two thousand people. It was led by Lee Peterlin. She says early results that losing weight in the stomach area may help younger people who experience migraines, especially women.

　　56.From the first paragraph, we can infer a migraine can

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