The symptoms of premature rupture of membranes include the following aspects: First, the most important symptom is the intermittent discharge of clear fluid from the vagina, which is often the most typical symptom of premature rupture of membranes. Second, abdominal pain can occur, as the rupture of the membranes can stimulate contractions causing pain. Third, sometimes there may be a small amount of spotting, mainly due to a small amount of bleeding caused when the membranes rupture. The causes of premature rupture of membranes include the following aspects: First, excessive amniotic fluid can cause high pressure inside the amniotic cavity, which may sometimes lead to spontaneous rupture of the membranes. Second, if there is local inflammation, such as chorioamnionitis, it can also cause the membranes to rupture under severe conditions, leading to premature rupture of membranes.