The cause of ketone body 4+ in pregnant women may be gestational diabetes, severe pregnancy reaction, etc., which can be relieved by controlling diet, lowering blood sugar and supplementing electrolytes. 1. Gestational diabetes: If the blood sugar control is not good, ketoacidosis may occur, at this time the ketone body 4 +, at this time should be timely use of insulin, metformin and other drugs for hypoglycemic treatment, in the usual need to control the diet, control the intake of sugar to reduce ketone body. 2. Intense pregnancy reaction: severe pregnancy vomiting may lead to malnutrition, digestive and absorption disorders, which leads to ketone body 4+, can be relieved by using a small meal diet, appropriate supplementation of vitamin B, etc., and if necessary, hospitalization fasting, supplementation of water, electrolytes and so on. If a pregnant woman develops ketone body 4+, she should seek medical treatment in time, and relevant medications should be used under the guidance of a doctor.