Early pregnancy thin if it is pregnancy vomiting and other early pregnancy reactions lead to, generally is a normal phenomenon, but if accompanied by abnormal symptoms, is not normal, to be specifically analyzed. 1. Normal physiological phenomenon Most women in early pregnancy will appear early pregnancy reaction, which is related to the elevated level of hormones in the body, there will be dizziness, fatigue, loss of appetite, nausea, vomiting, aversion to grease, gastrointestinal flatulence and other symptoms. If the symptoms are more serious, it may affect the normal diet, and there may be symptoms of thinning in early pregnancy. 2. Pathological phenomena Diabetes mellitus, hyperthyroidism and digestive disorders can cause metabolic abnormalities, resulting in significant weight loss, which is usually accompanied by other symptoms, such as excessive drinking, excessive eating, excessive urination, change in stool properties. You should go to the hospital in time to get medical attention and get a clear picture of the cause of the disease and treat the symptoms. In early pregnancy, you should pay attention to supplemental nutrition to ensure that the body and the fetus needs, if there are symptoms of disease, you should be actively treated.