Suppose How to prevent headaches after air travel<br>Try ibuprofen. Oftentimes, headaches that occur during or after flight are due to a sudden change in altitude. The painkiller ibuprofen may effectively prevent altitude related headaches before they begin.
Can we infer that "Headaches that occur during or after flight are usually due to a sudden change in altitude."? Yes, no, or maybe?
Suppose How to prevent headaches after air travel<br>Try ibuprofen. Oftentimes, headaches that occur during or after flight are due to a sudden change in altitude. The painkiller ibuprofen may effectively prevent altitude related headaches before they begin. Can we infer that "Headaches that occur during or after flight are usually due to a sudden change in altitude."? Yes, no, or maybe?