Nidanam or the cause of any disease is analysed through examining the doshic tendencies of the body. Nidanam is an ayurvedic technique used for diagnosis of any discomfort of the body. Nidanam can only be understood by studying about what factors aggravate the doshas and how different doshas are the causing factor of diseases. Categorisation of Nidanam is several and each technique is useful for analysing the cause of specific diseases. Sannikrista Nidanam is described as the immediate cause of aggravated doshas which causes disorders and diseases. This immediate cause might be improper food or a drawback in daily routine which is harmful to the body. The Vipakrista Nidanam is the distant cause of the disease and in this case there is an interval between the cause and the occurance of the disease. The third category among this group is the Vyabhicharika Nidanam where the cause is too weak to lead to disease or illness. In Predominant cause or Pradhanika Nidanam, the cause is given predominance. The elimination of the cause is more important than curing the symptoms, discomforts and the aggravated dosha, such as in case of poisoning. Dosha Nidanam,the cause is the imbalance in Doshas by influence of changing seasons. As in, Vyadhi Nidanam, certain abnormal habit are found to be the cause of any disease. Ubhaya Nidanam, points out a single reason for dual symptoms and problems. Utpaadaka Nidanam means susceptible cause and Vyanjaka Nidanam implies present or existing cause. Thus the categorisation under the branch of Nidanam has helped in preparing formulas and ayurveda products based on the various causes of different ailments.