The serratus plane block (SAPB) is a regional anaesthesia technique that provides analgesia from thoracic dermatomes T2–T9 by targeting the lateral branches of intercostal nerves. It is widely used for pain management in procedures such as mastectomy, thoracotomy, rib fractures, and subcostal surgeries. The block involves injecting local anaesthetic into the fascial plane between the latissimus dorsi and serratus anterior muscles, with thoracodorsal vessels serving as an anatomical landmark. SAPB can be performed in a superficial or deep approach, with the latter preferred for more extensive pain relief. Ultrasound guidance enhances precision and safety by facilitating real-time visualisation of the needle and anatomical structures, reducing complications such as pneumothorax and vascular injury. Continuous catheter-based techniques are employed for prolonged analgesia, particularly in post-surgical and trauma patients. SAPB offers a safer alternative with fewer haemodynamic risks than thoracic epidural or paravertebral blocks. However, it may cause temporary motor weakness due to inadvertent blockade of the long thoracic or thoracodorsal nerves. OAPB is an effective and relatively simple technique for pnalgesia in thoracic and upper abdominal procedures.