Charak Samhita
वायोर्धातुक्षयात् कोपो मार्गस्यावरणेन च (वा) । वातपित्तकफा देहे सर्वस्रोतोऽनुसारिणः ॥५९॥
The provocation of vata is either due to dhatukshaya, means diminution of tissue elements and/ or due to avarana means obstruction to its pathway. The vata, pitta and kapha, always circulate through all the body channels.
english translation
vAyordhAtukSayAt kopo mArgasyAvaraNena ca (vA) । vAtapittakaphA dehe sarvasroto'nusAriNaH ॥59॥
hk transliteration by Sanscript