Altitude sickness and High-altitude sickness

Altitude sickness noun - Effects (as nosebleed or nausea) of oxygen deficiency in the blood and tissues at high altitudes.

High-altitude sickness and altitude sickness are semantically related. in effects of oxygen deficiency topic. In some cases you can use "High-altitude sickness" instead a noun phrase "Altitude sickness".

Altitude sickness and high-altitude sickness are semantically related. Sometimes you can replace phrase "Altitude sickness" with "High-altitude sickness", this phrases are similar.