The present review study was an effort to assess the perception of various researchers (Available in the form of literature) regarding the causes, sign, symptoms, and effects of malnutrition on human health. Various research articles congregated for the purpose to review the perceptions of different researchers regarding the causes, sign and symptoms and effects of malnutrition on the health of children. After study the perception of different researchers available in the form of literature, the researcher arrived at conclusion that unbalance diet, psychological problems, digestive syndromes and stomach conditions etc all are the causes of malnutrition. It also concluded by the researcher from the available literature, that loss of fat, difficulty in respiration, and complication during surgery are the main sign and symptoms of malnutrition. Furthermore, under nutrition can lead the body toward weakness and over nutrition lead the body toward obesity.