Do ultrasound can not eat this question depends on the situation, according to the different requirements of the different parts of the examination: 1, if the ultrasound examination of the liver, gallbladder, spleen, pancreas, stomach, intestines, adrenal glands, abdominal blood vessels and other parts of the ultrasound examination, you need to fasting can not eat. First, after the meal will make the gallbladder contraction, bile emptying, affecting the observation of the gallbladder, secondly, after the meal there will be food residue in the stomach, so that the contrast agent coating unevenly caused false positive results, thirdly, after the meal the abdominal gas increases, affecting the liver, pancreas, adrenal glands, and abdominal blood vessels and other ultrasound images show, so these parts of the ultrasound can not be eaten. 2, if the examination of urinary, transabdominal gynecological ultrasound does not need to be Fasting, you can eat and also need to drink water, hold urine. 3, if you do the thyroid, breast and other superficial organ parts as well as the heart, peripheral blood vessels and other ultrasound, eat or not eat have no effect. Therefore, whether you can eat or not is determined by the part of the body to be examined.