Silent hypoxia (shima hypoxia mai farin ciki ) shi ne hypoxia wanda bai dace da ƙarancin numfashi ba. An san yana da rikitarwa na COVID-19. Ana hasashen cewa wannan yanayin yana faruwa ne ta hanyar SARS-CoV-2 da ke shafar kwararar jini na hanyoyin huhu, ban da magudanar jini a cikin huhu, wanda dole ne ya dace da shi don ba da damar iskar da ta dace, amma ba ta yi tasiri sosai ba. haifar da ƙarancin numfashi. Hakanan ana hasashen cewa hypoxia na iya faruwa ta hanyar samuwar ƙananan gudan jini a cikin huhu. An nuna cewa yawan numfashi na marasa lafiya da COVID-19 yana karuwa a hankali, wanda hakan ke haifar da hypoxia na shiru. An kuma nuna cewa marasa lafiya na COVID-19 suna samun ƙarancin ƙarancin numfashi bayan motsa jiki fiye da marasa COVID-19. Hakanan an san yanayin yana haifar da ciwon huhu da ciwon tsayi . Wani kayan aiki da ake amfani da shi don tantance hypoxia shiru shine gwajin tafiya na mintuna shida, ( 6MWT ), inda majiyyaci ke tafiya a cikin taki na yau da kullun na mintuna shida, don saka idanu kan martanin ilimin halittar jiki.