General anaesthesia is associated with higher mortality rate in comparison to regional anaesthesia. Spinal anaesthesia provides a fast, intense, and balanced sensory and motor block of high value in patients undergoing lower abdominal and lower limb surgeries .spinal anaesthesia have fewer sides effects and risk than general anaesthesia .patients recover faster and can go home sooner. Hypotension during spinal anesthesia is the most common complication of spinal anesthesia. Hypotension is due to sympathetic nervous system blockade. Spinal induce hypotension can cause significant morbidity and mortality for both mother and fetus. Prevention rather than treatment is the aim of this book.