Usually, local anesthesia has no effect on pregnancy. Local anesthesia is preferred when pregnant women undergo surgery. The drugs used for local anesthesia mainly hit the spine, as well as the epidural or surgical site, the drug content is not much, the concentration is not high, the drug mainly acts on the local tissues, which can block the peripheral nerves to inhibit the pain conduction, and it will not pass through the placental barrier, so it has little effect on the pregnant woman, and it will not affect the growth and development of the fetus. The more commonly used local anesthesia drug is lidocaine, which has stronger penetration, faster onset of action, fewer side effects on the human body, and quicker anesthesia fading effect after the operation, usually 1-2 hours will completely fade. However, it is recommended to avoid the use of medication as much as possible during pregnancy, all drugs are not absolutely safe. Drugs enter the bloodstream and tend to affect the conduction effects of the heart muscle, nervous system and skeletal muscle. If the anesthetic enters the more vascular areas, it can affect the fetus. If a pregnant woman must undergo surgical treatment, she should undergo all relevant examinations to ensure that her body can tolerate the surgical treatment, and use anesthetics in a reasonable manner.