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High-Altitude Pulmonary Edema (HAPE) is indeed classified as a life-threatening condition that affects the lungs. It occurs when fluid accumulates in the alveoli of the lungs, typically due to rapid ascent to high altitudes where the body is not able to acclimatize quickly enough to the low oxygen levels. This condition can severely impair a person's ability to breathe and can lead to serious complications if not treated promptly.

Understanding that HAPE is categorized as life-threatening underscores the critical nature of recognizing its symptoms and the need for immediate intervention. Symptoms include difficulty breathing, coughing, and a reduced ability to exercise, which highlight how it directly impacts lung function. Prompt descent to a lower altitude and medical assistance are essential for recovery, reinforcing the understanding of its severity.

Other options, such as it being common or non-threatening, directly mischaracterize the risks and seriousness associated with HAPE. Additionally, categorizing it as curable related to joints does not apply, as this condition is specific to the pulmonary system and requires immediate medical attention rather than being simply treatable.