Ciwon huhu yanayi ne mai kumburin huhu da farko yana shafar kananan buhunan iska da aka sani da alveoli. Alamun yawanci sun haɗa da wasu hadewar tari mai albarka ko bushewa, ciwon ƙirji, zazzabi, da wahalar numfashi. Tsananin yanayin yana canzawa. Yawanci ana haifar da ciwon huhu ta hanyar kamuwa da ƙwayoyin cuta ko ƙwayoyin cuta kuma ƙasa da ƙasa ta wasu ƙananan ƙwayoyin cuta, wasu magunguna ko yanayi kamar cututtuka na autoimmune. Abubuwan haɗari sun haɗa da cystic fibrosis, cututtukan huhu na huhu (COPD), cutar sikila, asma, ciwon sukari, gazawar zuciya, tarihin shan taba, rashin iya tari (kamar bin bugun jini), da raunin garkuwar jiki. Ana gano cutar sau da yawa akan alamomi da gwajin jiki. X-ray na kirji, gwajin jini, da al'adun sputum na iya taimakawa wajen tabbatar da ganewar asali. Ana iya rarraba cutar ta inda aka samo ta, kamar al'umma- ko asibiti da aka samo ko ciwon huhu mai alaƙa da lafiya. Akwai alluran rigakafi don hana wasu nau'ikan ciwon huhu. Sauran hanyoyin rigakafin sun hada da wanke hannu da rashin shan taba.