What are the symptoms and effects of low progesterone in people? Progesterone is an important progesterone that plays an important protective role in pregnancy. If progesterone is low, it can cause a range of symptoms and effects. This article will elaborate on the effects and symptoms of low progesterone from three aspects: mood, menstruation and fertility, and pregnancy. In terms of emotions, if progesterone levels are low during pregnancy, mood swings often occur, and the mother will feel emotionally unstable, irritable, and depressed. This may be caused by a reduction in the neuroprotective effects of progesterone in the brain, leading to an imbalance of neurotransmitters. At the same time, progesterone