Dizziness and chest tightness at 10 weeks of pregnancy may be a normal physiological phenomenon, but it may also be caused by pathological factors. 1. Physiological phenomenon: After pregnancy, the hormone levels in the body will change, nausea, vomiting, drowsiness and other early pregnancy reactions, to 12 weeks of pregnancy, early pregnancy reactions will gradually improve, do not need to worry too much. 2. Pathological factors: women in the 10th week of pregnancy, may be due to loss of appetite, vomiting and other early pregnancy reaction leads to malnutrition, pregnancy anemia or hypoglycemia phenomenon, will be manifested as dizziness, chest tightness and other uncomfortable symptoms. In addition, when a woman is pregnant, the increase in blood volume will increase the burden on the heart, resulting in increased blood pressure, which will cause the pregnant woman to experience dizziness and chest tightness. When a pregnant woman in the 10th week of pregnancy has the symptoms of dizziness and chest tightness, she should go to the hospital in time to do blood routine and other tests to clarify the cause and then treat it, so as not to affect the normal development of the fetus. During pregnancy, pay attention to more rest, at the same time should relax, avoid tension, anxiety, any discomfort should be timely to the hospital, the doctor to clarify the diagnosis, and cooperate with the doctor to deal with the symptoms.