altitude sickness
US /ˈæl.tɪ.tuːd ˌsɪk.nəs/
UK /ˈæl.tɪ.tuːd ˌsɪk.nəs/

1.
mal de altitude
a sickness that can affect people who travel to a high place very quickly
:
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Many climbers experience altitude sickness when ascending high mountains.
Muitos alpinistas experimentam mal de altitude ao subir montanhas altas.
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Symptoms of altitude sickness include headache, nausea, and dizziness.
Os sintomas do mal de altitude incluem dor de cabeça, náuseas e tontura.