Why do 20-year-old girls have menstrual cramps every month

Patient's question:

Here is the English translation of the provided text, with the return characters kept as they are:
One year has passed, and every month she has been in severe pain. I don't know how to help her. When she's in pain, her face turns very pale. After a day, the pain goes away, and everything is fine. I hope everyone can offer some advice. First question supplement: She also has a strong aversion to sex. If she's accidentally touched, she has a very strong reaction. Is this due to psychological factors? Will she always be like this? Are there any good methods to deal with this?

Doctor's answer:

Hello, menstrual cramps are caused by the shedding of the endometrium releasing prostaglandins, leading to uterine smooth muscle contraction. In severe cases, it can cause intestinal smooth muscle spasm, resulting in abdominal pain, nausea, and vomiting.
Pay attention to keeping your abdomen warm and avoid getting cold. During your period, pay attention to hygiene, change sanitary pads frequently, avoid tub baths, do not eat raw, cold, spicy, or irritating foods, avoid strenuous exercise, and maintain emotional stability.

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