Pre period, also known as premenstrual syndrome (PMS), is a syndrome that up to 90% of women will experience in their reproductive lives. It is characterized by headaches, mood swings, anxiety, irritability or upset, tiredness or trouble sleeping, stomach pain, breast tenderness, spotty skin or greasy hair, and changes in libido and appetite. The causes are not fully understood, but some doctors think that changes in hormone levels due to the menstrual cycle is the cause.
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