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Background: Women's pain satisfaction post-cesarean section remains a challenge. Accurate assessment of pain severity of post-cesarean section helps to choose the most appropriate anesthetic approach, drug, and dose, as well as improvement of treatment of postoperative pain. Our objective was to compare the efficacy of ultrasound-assisted transversus abdominis plane (TAP) block versus IV patient-controlled analgesia (PCA) in the first 24 h postoperative in women who underwent cesarean section. The primary outcome was postoperative pain at 2, 4, 6, 12, and 24 h. The secondary outcomes were intestinal mobility, early mobilization, nausea, vomiting, heart rate, and respiratory rate. Results: A cross-sectional study has been conducted on 70 women who are planned for elective cesarean section. They were divided into 2 groups; "group A" (n = 35), women who received TAP block, and "group B" (n = 35), those who received PCA. Pain score, heart rate, respiratory rate, intestinal motility, nausea, and vomiting have been assessed 2, 4, 6, 12, and 24 h postoperatively. The degree of pain was significantly lower in "group B" than in "group A" in all time intervals (p < 0.001). Heart rate was significantly higher in women in "group B" compared to those in "group A" only at 2 and 4 h postoperative (p < 0.001). Nausea and vomiting were also significantly higher in women in "group B" compared to those in "group A" (p value 0.03 and 0.04, respectively). Regarding intestinal motility, it was audible in "group A" earlier than in "group B." Conclusions: Both TAP block and PCA are effective in postoperative pain relief after cesarean section; however, PCA is more superior, especially for visceral pain. Nevertheless, TAP block has the privilege of avoiding systemic action of opioids used in PCA. PCA can easily be applied while TAP block needs more training and an intraoperative ultrasound machine. Complications and side effects of both were minimal when adjusting the doses. [ABSTRACT FROM AUTHOR]