What's wrong with feeling tired when I'm four months pregnant?

I am now four months pregnant, but I feel very tired recently. I want to know why I feel so tired after four months of pregnancy?

Feeling very tired in the fourth month of pregnancy is because the size of the fetus gradually increases, and the uterus will also increase significantly. The enlarged uterus will cause certain damage to the female lumbar spine and surrounding tissues and organs. When pregnant women stand for a long time, walk or bend over frequently, and carry heavy objects, the fatigue of pregnant women will increase. During pregnancy, women should rest in bed more, maintain adequate sleep, avoid overwork, do not walk or stand for a long time, go to the hospital for regular check-ups, and develop good living habits, avoid staying up late, and avoid excessive mental burden .