Here's a breakdown of how it's used:
* -pnea: This suffix is added to the beginning of a word to indicate a condition related to breathing.
* Examples:
* Apnea: Absence of breathing.
* Dyspnea: Difficult or labored breathing.
* Hyperpnea: Increased rate and depth of breathing.
* Orthopnea: Difficulty breathing when lying down.
* Tachypnea: Rapid breathing.
So, whenever you see "-pnea" at the end of a medical term, it usually indicates something about breathing.