You can usually drink water before the ultrasound, but some parts of the body are more specialized, so even if you can drink, you need to control the amount of water you drink appropriately. Ultrasound can check the diseases of many organs, such as breast, thyroid, genitourinary system and so on. If you judge whether there is any disease in the above parts, you can drink water, because drinking water will not interfere with the results of the examination. In addition, the urinary system and the female reproductive system ultrasound need to hold urine to check the image is more clear, so these parts of the examination should also be appropriate to drink more water before the bladder is full before the consultation. Check the liver and gallbladder ultrasound, in principle, should not drink and eat before the examination, because the fasting state of the examination can be a comprehensive examination of the liver and gallbladder and other organs. However, water is prohibited for too long time is easy to produce discomfort, and some people have special circumstances, suffering from high blood pressure, diabetes and other chronic diseases need to take medication with the help of water, this situation can be a small amount of water, but in order not to affect the results of the examination can not be a lot of drinking before the examination. In order to check the results more accurately, it is best to consult your doctor in detail about the precautions to be taken before the examination, and you should strictly follow the doctor’s instructions.