Increased HCG levels can be caused by a tumor of the placenta called hydatidiform mole. This condition should be ruled out in women with morning sickness. Other possible causes include pancreatitis, bowel disease, and vitamin deficiency. There is some evidence that psychological factors, such as ambivalence toward pregnancy, can increase the risk of morning sickness. There is no known way to prevent morning sickness.
Morning sickness is diagnosed on the basis of the symptoms.
Urinalysis may be done, as well as blood tests to check for dehydration . Possible long-term effects of morning sickness are weight loss, dehydration, imbalances in fluids and electrolytes, and starvation. If these are not treated, they can lead to liver, kidney, heart, and brain damage to the mother and the fetus. Severe morning sickness can strain a marriage, and hinder job performance. Most women feel better after the start of the second trimester and the pregnancy can continue with no further problems.