The causes of emaciation are: mental factors, emotional factors, mental anxiety, irregular life, overwork, lack of sleep, and physical consumption exceeding intake, all of which will cause emaciation. Dietary factors, irregular diet, lack of physical exercise, lack of nutrition, especially the lack of protein ingredients, are more likely to cause weight loss.

Of course, there is pathological emaciation (caused by diseases). The common diseases that lead to emaciation include intestinal parasites, long-term active tuberculosis, anemia, diabetes, hyperthyroidism, malignant tumors, pituitary dysfunction and some metabolic diseases.