In broader sense both represent accompanying symptoms, but Concomitant symptoms is non-pathological hence peculiar whereas associated symptoms have got pathological relationship with the main symptoms – hence common and less important. (2)
The concept of Concomitant is owned by Dr. Boenninghausen who has given a new dimension to Concomitant symptoms. He used these words to explain uncommon phenomena accompanying the main trouble. He was the first to notice that the certain symptoms are opting to appear in-group. He further observed that these symptoms have no other relationship to the group of chief symptoms than their time association, thus giving individuality to the picture and help to differentiate it from similar picture. In other words these represent the characteristic differentiating features.
He further observed in the material medica that certain medicine has greater propensity to produce Concomitant symptoms. He thus started collecting the concomitant symptoms and placed them in his Therapeutic Pocket Book in a generalized form in relation to the particular affection.
In homeopathic concept of concomitant symptoms we do not find any logical cause but it has a deep meaning in every case of disease as well as the medicines and related to the constitutional differences and tends to remain constant with patient, irrespective of the nature of the disease. (9)