From poison, the body is beset by fainting, diarrhea, darkening of vision, burning sensations, and dizziness. Anger brings trembling and headache, while fear and grief lead to delirium. Desire, too, gives rise to dizziness, loss of appetite, burning, shame, excessive sleep, and confusion of intellect and memory. When one is possessed or affected by similar disturbances, the symptoms of all three humors—wind, bile, and phlegm—may combine, with wind and the others showing themselves first. There are fevers that arise from anger or from an excess of bile, as well as those caused by curses and black magic. Among these, the two severe fevers born of deranged humors are considered the most unbearable. When afflicted by spells and incantations of sorcery, the body is tormented, first suffering physical distress, then eruptions and confusion of mind. For one constantly seized by burning and fainting, the fever increases day by day. Thus, fever is seen in eight forms, but in summary, it is of two kinds: bodily or mental. Each may be gentle or intense, internal or external in origin, natural or unnatural, curable or incurable, simple or complicated. Bodily fever begins with heat in the body, while mental fever starts with heat in the mind. If wind predominates, coldness occurs, especially when phlegm is present. When bile is involved, burning arises; and when the humors are mixed, the disturbance retreats within. In such fevers, greater disorders emerge—internal agitation and retention of wastes. If the cause is external, the heat is also external and becomes established outside the body. In the rainy, autumn, and spring seasons, fever arises in due order from wind and the other humors. The unnatural type of fever is different and difficult to cure, while the natural form most often arises from wind. In the rainy season, disturbed wind causes fever accompanied by bile and phlegm. In autumn, bile predominates, with phlegm following; yet, due to the nature and release of these humors, there is no danger from eating various foods at that time. In spring, phlegm is most prominent, and then wind and bile may follow. When the disorder is mild, fever is curable and free from complications. Whenever the disorder is recognized, it is said beforehand to be incurable. Severe complications include weak digestion and excessive urination. There is no appetite, digestion fails, hunger disappears, and the fever’s appearance is unmistakable. The intensity of fever increases, bringing thirst, delirium, labored breathing, and dizziness. The urge to pass waste and its disturbance are signs that the fever is maturing; if there is no reversal, fasting for seven nights brings resolution. Fever is described as fivefold, depending on the state of waste, time, strength, and weakness; yet most often, it is said to arise from the derangement of all three humors. Fevers may be continuous, constant, recurring every other day, every third day, or every fourth day. These are carried by the humors, urine, and feces, and are widespread due to the accumulation of wastes. They heat the entire body, increasing equally from the onset, and are strong and heavy, residing in the vital fluids without distinction. Such constant, unopposed fevers are extremely hard to endure; fever or heat, or the disturbed humors, can quickly destroy the body. In all forms, whether the vital fluids and others are pure or impure at the time, wind, bile, and phlegm can cause fever in seven, six, or twelve days. Generally, the boundaries of fever—both for liberation and destruction—are agreed upon by the sages Agnivesha and Harita. The seventh day, which may be doubled, as well as the ninth and eleventh days, mark the boundaries of the three doshas for both recovery and decline. Due to purity or impurity, fever may persist for a long time, especially in those who are emaciated, afflicted by disease, or who indulge in improper diets and similar habits. Even a small defect, gaining strength from impurity or other causes, becomes antagonistic and irregular, increasing and decreasing unpredictably. With such disturbance, it produces fever with irregular increases and decreases; the dosha acts in them, fevering strongly at its own time. It ceases again, with the strength or weakness of the antagonist; when the dosha is diminished, the subtle fever merges only into the fluids and similar tissues. Because of this merging, it causes emaciation, discoloration, dullness, and similar conditions, due to the altered channels carrying fluids. The defect does not quickly spread throughout the whole body; those who are virtuous are always thus, but the opposite is true in contrary cases. Irregular in onset, sometimes beginning at night, the dosha residing in the blood generally produces continuous fever. At the junction of day and night, it occurs once, and on another day it may reappear, affecting the flesh-carrying and fat-carrying channels in succession. Grasping fever arises from bile and wind in the head, from phlegm and bile in the trika region, and from wind and phlegm in the back, usually appearing after one day. A fourth type is situated in the impurities, fat, marrow, or bone; another is found only in the marrow and bone, revealing its effects there. Phlegm is twofold, affecting the calves, and first arises from wind in the head; when it reaches bone and marrow, it is the reverse of the fourth type. Threefold, it causes fever for three days, but releases for one day, its course determined by the strength of the doshas and their origins. When there is no reversal, these fevers require fasting for seven nights; fever affects the mind as well as actions, both at the time and otherwise. Because of deep-seated behavior in the tissues, and arising from combination and equal increase of the doshas, the fourth type is difficult to treat. In subtle fevers, and those that move farther and farther away, the dosha travels slowly and slightly along the path of blood and other channels, taking a long time. It penetrates the body and leaves nothing untouched, causing burning and similar symptoms. When the sequence is interrupted by effort, fever with burning is observed. Such fevers are uneven, with a difficult onset, often following the course of the night; each successive stage is slower and weaker, as is appropriate. Over time, the disorder acquires corresponding tastes and qualities; when provoked, it may burn fiercely, sometimes after a long delay.