The side effects of lumbar anesthesia are mainly the following: 1, after lumbar anesthesia because of the action of local anesthetics caused by peripheral vasodilatation, especially in patients with cesarean section, late pregnancy due to the action of the fetus to compress the lower limb veins, muscle relaxation after peripheral vasodilatation, it will cause transient hypotension or nausea, vomiting, etc.; 2, the puncture needle is too large resulting in cerebrospinal fluid leakage, which can cause low pressure headache, nausea, vomiting; 3, puncture The point is repeatedly operated, not every patient can end up with one needle during epidural puncture, and patients with spinal space stenosis or obesity may be punctured several times. Normal epidural puncture needle into 4-6cm can reach the epidural level, while obese patients or patients with poor body position is not easy to operate, sometimes need to repeatedly operate several times to achieve the desired effect, so after lumbar anesthesia can be local puncture point injury, pain, is also more common after lumbar anesthesia.