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इति ज्वरोऽष्टधा दृष्टः समासाद् विविधस्तु सः । शारीरो मानसः सौम्यस्तीक्ष्णोऽन्तर्बहिराश्रयः ॥ ४६ ॥
Thus was described the eight kinds of fever stated in brief, it is again of two kinds viz, Sharira (bodily), and Manasa (mental); Saumya (mild) and Tikshna (severe); Antah (internal) and Bahya (external);
english translation
प्राकृतो वैकृतः साध्योऽसाध्यः सामो निरामकः । पूर्वं शरीरे शारीरे तापो मनसि मानसे ॥ ४७ ॥
Prakrita (normal to the season) and Vaikrita (abnormal to the season); Sadhya (curable) and Asadhya (incurable); Sama (caused by Ama) and Nirama (not caused by Ama). In the Sharirika (type of fever) the exhaustion (due to increase of heat) is first in the body, in the Manasika (fever) it is first in the mind.
english translation
पवने योगवाहित्वाच्छीतं श्लेष्मयुते भवेत् । दाहः पित्तयुते मिश्रं मिश्रेऽन्तःसंश्रये पुनः ॥ ४८ ॥
Because Pavana (Vata) is Yogavahi (ambivalent) it produces cold (shivering) when associated with Kapha; burning sensation when associated with Pitta and mixed symptoms when associated with combination of all the doshas.
english translation
ज्वरेऽधिकं विकाराः स्युरन्तः क्षोभो मलग्रहः । बहिरेव बहिर्वेगे तापोऽपि च सुसाध्यता ॥ ४९ ॥
In case of Antar Jvara (antarvega jvara – internal fever), great heat inside the body, and other abnormalities such as shock and non-elimination of wastes are found; whereas in Bahirvega Jvara (external fever) heat is more outside (in the skin) and is curable easily.
english translation
वर्षाशरद्वसन्तेषु वाताद्यैः प्राकृतः क्रमात्। वैकृतोऽन्यः स दुःसाध्यः प्रायश्च प्राकृतोऽनिलात्॥५०॥
In this varsha (rainy season), sharat (autumn) and vasanta (spring) fevers arising from vata etc. (vata, pitta and kapha) respectively are prakrita (seasonal, natural or identical with the qualities of the season) in that order. Whereas others are vaikrita (non seasonal, unnatural, dissimilar with the qualities of the season) which are difficult to cure. Generally, fever arising from vata is difficult to cure though it be prakrita.
english translation