Medical paraffin oil is harmless to people when used normally. Medical paraffin oil is a liquid paraffin that is widely used in the medical field. If paraffin wax is not used properly, it may affect the respiratory tract and digestive system. 1. Medical paraffin oil is liquid paraffin, widely used in the medical field, play a role in lubrication and so on. 2. It can be harmful if used improperly in life: (1) paraffin wax if often inhaled this type of material then it is possible to produce stimulation of the respiratory tract appear similar to second-hand smoke like complications such as bronchitis and pneumonia and so on. (2) In addition, if paraffin wax enters the digestive system, then paraffin wax will be attached to the inner side of the intestinal wall is not easy to discharge, thus causing a sense of satiety, leading to indigestion, such as anorexia and nausea, and other common symptoms, such as anorexia and nausea, and if there is a particularly long period of time, it is possible that cancer may occur, but the probability of this is not low. If you need to apply paraffin wax in your life, you must apply it under the guidance of local professionals to avoid improper dosage that will affect your body, because as long as the proper dosage is used, the danger is extremely low.