The manifestations of iron deficiency during pregnancy vary according to the degree of iron deficiency, which is mild to moderate. Mild may not be obvious symptoms, moderate and severe symptoms are obvious, there are dizziness, fatigue, edema, dyspnea and so on. 1. Mild iron deficiency: When iron deficiency is mild, hemoglobin and red blood cell test indexes can be maintained within the normal range, and the symptoms of iron deficiency may be mild or even without discomfort. 2. Moderate and severe iron deficiency: when iron is further depleted, it will enter the manifestation of iron deficiency anemia, the reserve iron is consumed, serum iron is getting less and less, and iron deficiency anemia is manifested. There may be the phenomenon of pale face and mucous membranes, as well as palpitations, shortness of breath, difficulty in concentrating, dizziness, tinnitus, blurred vision, fatigue, memory loss and other symptoms. In summary, pregnant women should pay attention to more nutrition during pregnancy, eat more food containing iron as appropriate, check the serum iron content in the body in time, if the diagnosis of iron deficiency, need to be treated under the guidance of a professional doctor. If at any time there is dizziness, weakness, edema, dyspnea and other uncomfortable symptoms, be sure to seek medical attention as soon as possible.