Hello Considerate630036, In the subcutaneous space between the fascia covering the muscle and the Scarpa's fascia on the skin, where most liposuction is performed, there are no 'main arteries.' Certainly there are arteries and veins in this space, but they are relatively small and will not cause massive hemorrhage if injured during surgery. Liposuction cannulas are blunt tipped and all larger that the blood vessels that are in the subcutaneous tissue, making it more likely that the cannula will allow the artery to 'roll around' the side of the cannula during the procedure rather than poking right through it. Certainly, bleeding can occur during liposuction or any other surgical procedure, however, it is not likely to be severe. If a blood vessel that we described above were to be injured during the procedure, you would notice bruising of the skin (which is likely to happen after liposuction anyway) or a collection of blood under the skin called a hematoma. The smaller blood vessels in the areas where we perform liposuction will stop bleeding on their own or with just mild pressure such as you get with your post-operative compression garments. I would recommend consulting with a qualified surgeon who can further address your specific concerns regarding bleeding. Best of luck!-Dr. Smith