There are many reasons for loss of appetite, mainly the following: 1, consider the mental factors, due to work pressure or life changes, resulting in low mood, nervousness, depression, etc. affects the appetite. 2, consider is caused by injury to the food, due to eating a large number of greasy or indigestible food, resulting in gastrointestinal overburdening and indigestion, the accumulation of food within the stopping do not want to eat. 3, consider is caused by gastric disease, the presence of digestive disorders, gastritis or gastric ulcers, can also lead to bloating, stomach pain and reluctance to eat. 4, consider is caused by early pregnancy reactions. The presence of digestive disorders, gastritis or gastric ulcers, etc., can also lead to stomach bloating, stomach pain and do not want to eat. 4, consider the early pregnancy reaction, if you have sex and menstruation delayed, after more than forty days of pregnancy will suddenly appear nausea, vomiting, anorexia and other early pregnancy reaction, it is recommended that urine pregnancy test to clarify, so as to avoid indiscriminate use of medication to avoid affecting the normal growth and development of the fetus.