In this thesis, the main subject are the thyroid diseases and artistic expression that can describe the symptoms of different thyroid disorders. The thyroid gland is an endocrine organ in the human body, situated in front of trachea, which is responsible for a number of metabolic processes in body including the mental processes. Excessive or insufficient secretion of thyroid hormones can develop thyroid disorders and diseases which are familiar to mankind from the ancient times. The visual phenomenon caused by thyroid disorders has always interested and provoked people's imagination, especially the artists' one. During many psychological and psychiatric researches, a drawing, that is an image, seen as a projective method of releasing negative emotions, showed positive results as being a good indicator of the psychological disturbances of an individual. Therefore, the use of this method has become more and more applied in the diagnostic and therapeutic approach. The aim of this study was to investigate whether the understanding of colours and artistic expression can be a useful indicator of one's perception of the thyroid disorder and emotions which appear as a result of the disease. The results revealed that the prevailing emotional states are anxiety and despondency which have been presented in the body mapping. The colours that dominate the negative emotions are red, black, grey and brown, while white, blue, orange and green dominate the positive emotions. The symptoms of the uneasiness related to the thyroid disorders are once again connected with black, grey and red colour. This pilot study showed that the artistic expression greatly supports a better understanding of the disease and the emotional conditions by the individuals who have been affected by this disorder. Also, this study can serve as basis for further investigation in this area to potentiate the conduction of art therapy.