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<p style='text-align:justify;'>Dosha can move from one marga to another. The movement of the dosha from internal pathway towards other marga will be clear in most of the diseases. But in the case of external pathways, the movement of dosha from shakha towards koshtha is not so easy. The reason may be that the diseases of the internal pathway produce many symptoms externally. But the diseases of the external pathway generally may not have any serious symptoms and signs pertaining to internal or medial pathway. The reason for this can be given in the following paras.  <ol type="a"><li>Body due to its defense mechanism generally tries to push out the factors, which are not suitable to it. If the koshtha is filled with such morbid factors, in order to defend the organs of koshtha from any type of damage they are pushed to other margas if not expelled out. This is done preferably through the marga of poshana. The causes of movement of the doshas from koshtha to shakha have been mentioned by acharya Charak. [Cha.Sa.Sutra Sthana 28/31] </li>

<p style='text-align:justify;'>Dosha can move from one marga to another. The movement of the dosha from internal pathway towards other marga will be clear in most of the diseases. But in the case of external pathways, the movement of dosha from shakha towards koshtha is not so easy. The reason may be that the diseases of the internal pathway produce many symptoms externally. But the diseases of the external pathway generally may not have any serious symptoms and signs pertaining to internal or medial pathway. The reason for this can be given in the following paras.  <ol type="a"><li>Body due to its defense mechanism generally tries to push out the factors, which are not suitable to it. If the koshtha is filled with such morbid factors, in order to defend the organs of koshtha from any type of damage they are pushed to other margas if not expelled out. This is done preferably through the marga of poshana. The causes of movement of the doshas from koshtha to shakha have been mentioned by acharya Charak. [Cha.Sa.Sutra Sthana 28/31] </li>

<li>The same case is not found in the diseases of external pathways. Because the morbid dosha will not be able to move back to koshtha easily. This is because the viloma gati of dosha will have to take place here. This sort of movement is possible only with the co-operation of the srotas. The causes of movement of doshas from shakha to koshtha , mentioned by acharya Charak, plays role for this. [Cha.Sa.Sutra Sthana 28/32] Thus, compared to abhyantar rogamarga, the diseases of bahya roga marga takes longer duration. </li></ol>

<li>The same case is not found in the diseases of external pathways. Because the morbid dosha will not be able to move back to koshtha easily. This is because the viloma gati of dosha will have to take place here. This sort of movement is possible only with the co-operation of the srotas. The causes of movement of doshas from shakha to koshtha , mentioned by acharya Charak, plays role for this. [Cha.Sa.Sutra Sthana 28/32] Thus, compared to abhyantar rogamarga, the diseases of bahya roga marga takes longer duration. </li></ol>

he movement of the morbid factors in the diseases of medial pathways will be of different type. In these diseases, the movement of the dosha will be from one organ to the other organ of the same roga marga. In diseases like amavata, vatarakta, etc. which are related with the joints coming under medial pathway, signs and symptoms of the malfunction of  heart (hridaya) or bladder (basti) or both etc. will be present. In the same way, the involvement of the heart may produce signs and symptoms related with extrenal pathway in their premonitory stage (purvarupavastha). Prameha and rajayakshma, which are the diseases of medial pathway, may be quoted as examples. In these disorders, excessive growth of hair, nails etc. are observed in premonitory stage.   

The movement of the morbid factors in the diseases of medial pathways will be of different type. In these diseases, the movement of the dosha will be from one organ to the other organ of the same roga marga. In diseases like amavata, vatarakta, etc. which are related with the joints coming under medial pathway, signs and symptoms of the malfunction of  heart (hridaya) or bladder (basti) or both etc. will be present. In the same way, the involvement of the heart may produce signs and symptoms related with extrenal pathway in their premonitory stage (purvarupavastha). Prameha and rajayakshma, which are the diseases of medial pathway, may be quoted as examples. In these disorders, excessive growth of hair, nails etc. are observed in premonitory stage.   

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It can be said that most of the diseases of external pathway originate from colon (pakwashayottha). In the diseases of external pathway apart from the external treatment (bahya chikitsa or bahirparimarjana chikitsa), virechana is preferred. It is only through suitable virechana dravyas, skin diseases are treated successfully.   

It can be said that most of the diseases of external pathway originate from colon (pakwashayottha). In the diseases of external pathway apart from the external treatment (bahya chikitsa or bahirparimarjana chikitsa), virechana is preferred. It is only through suitable virechana dravyas, skin diseases are treated successfully.