Why is the waist sore when pregnant?

Patient's question:

I am exactly 8 weeks pregnant. Last night while sleeping, I suddenly felt severe lower back pain. This morning after getting up, it's still the same. I want to ask if this is normal? What could be the cause?
Additionally, my left arm has been aching for many days. Is this also related to pregnancy?
First follow-up question: There are no other symptoms. However, over the past one and a half months, I have developed hives. Originally, they were very itchy every night, but recently they have become less itchy. Could my lower back pain be related to the hives?

Doctor's answer:

The causes of lower back pain are relatively numerous. For symptoms of early pregnancy, such as nausea and vomiting, fatigue, sudden increase in appetite, and irregular menstrual cycles (e.g., a delay of more than one week in menstruation for those who usually have regular periods), along with lower back pain.

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