The side effects of the chest and knee position method are generally improper use or use for too long, pregnant women may experience back pain, dizziness, nausea and other phenomena, and may even cause damage to the muscles of the waist, back, buttocks, thighs and knee joints. Pregnant women who are heavier, such as those who are more obese or in pregnancy, if they take the chest and knee position for a long time, it may cause muscle fatigue in the waist, back and hips, and then low back pain. At the same time in the exercise, pregnant women hip and thigh muscles continue to force, may cause hip and leg muscle weakness, walking out of bed will appear lower limb weakness, and even easy to fall. Pregnant women can take the towel hot compress, physical massage to reduce muscle soreness, after the action, you can sit down to rest, and then get up and move. Knee-chest position will also have an impact on the knees, both knees will rub with the bed or mat, a long time may appear knee skin break, which leads to knee pain, you need to stop the action in time, the broken skin disinfection treatment. In addition, long-term in the head low hip high position, pregnant women may have brain congestion, causing dizziness symptoms, but also lead to food reflux, nausea symptoms, pregnant women should stop rest when the symptoms of discomfort.