सन्धारणादत्यशनादजीर्णाध्यशनात्तथा| वर्चोवाहीनि दुष्यन्ति दुर्बलाग्नेः कृशस्य च ||२१||
Purishavaha srotas are afflicted due to suppression of urge of defecation, over eating, eating during indigestion, especially in persons with poor digestion and who are emaciated.
Swedavaha srotas are affected due to excessive physical exercise, excessive heat, inappropriate use of hot and cold substances, or emotions such as anxiety, anger, grief and fear.
आहारश्च विहारश्च यः स्याद्दोषगुणैः समः| धातुभिर्विगुणश्चापि स्रोतसां स प्रदूषकः ||२३||
[General etiology of vitiation] Diet and lifestyle that are suitable to dosha (similar in properties of dosha) and unsuitable to dhatu (dis-similar in properties of dhatu)in their properties cause morbidity in srotamsi.
[Four features of srotas morbidity] Increased flow or obstruction or formation of nodules and flow of bodily fluids or contents in the wrong or opposite direction are the features of morbidity of srotas.
स्वधातुसमवर्णानि वृत्तस्थूलान्यणूनि च| स्रोतांसि दीर्घाण्याकृत्या प्रतानसदृशानि च ||२५||
[Characteristics of srotas] Srotamsi have color similar to those of the dhatu they carry and are tubular, large or small, long and tendril-like in shape.