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Normal uterine contractions have a certain rhythm, polarity and consistency, and have the corresponding intensity and frequency. Abnormal, then known as the productive forces abnormalities were divided into uterine inertia, lack of coordination, and hyperactivity of three to uterine inertia the most common. Since the start of labor contractions may be weak or powerless, can be normal in the beginning, followed by a gradual weakening, the former referred to as “primary uterine inertia,” the latter as “secondary uterine inertia.” The causes and clinical manifestations between the two similar, but the latter is more secondary to mechanical obstruction.