Spinal anaesthesia is a medical procedure where a local anaesthetic is injected into the fluid-filled space around the spinal cord, numbing the lower half of the body. It is commonly used during surgeries such as cesarean sections, prostate surgery, and lower abdominal surgeries. Some synonyms for spinal anaesthesia include spinal block, spinal numbing, and spinal anesthesia. Other related terms include regional anaesthesia, epidural anaesthesia, and general anaesthesia. Spinal anaesthesia can be an effective and safe alternative to general anaesthesia, as it provides pain relief without putting the patient under complete sedation. However, as with any medical procedure, there are potential risks and complications that need to be carefully considered by doctors and patients alike.