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Harvard Medical School:::
High-altitude pulmonary edema, which is the lungs' response to an increase in altitude, may occur with or without other symptoms of altitude illness. A low oxygen concentration can trigger blood vessels in the lungs to constrict (tighten), causing a higher pressure in the lung arteries. This causes fluid to leak from the blood vessels into the lungs. Symptoms of high-altitude pulmonary edema commonly appear at night and can worsen during exertion.

Symptoms of high-altitude pulmonary edema include:

Chest tightness or fullness
Extreme fatigue
Inability to catch your breath, even when resting
Blue or gray lips and fingernails
Coughing, which may produce pink frothy fluid
Fever (temperature is above normal but is less than 101° Fahrenheit)

Article:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7096066/

PDF:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7096066/pdf/cureus-0012-00000007343.pdf

https://pancreatica.org/altitude-sickness-and-covid-19-surprising-new-symptoms/