Information about the side effects of apple cider vinegar can be found through various resources, such as WebMD and About.com. Consuming large amounts of apple cider vinegar may cause side effects, according to WebMD. Individuals with certain health conditions should use apple cider vinegar cautiously.
Undiluted apple cider vinegar liquid or pills can cause damage to the throat and digestive tract, according to About.com. Taking undiluted apple cider vinegar by mouth may damage tooth enamel. Apple cider vinegar may cause scarring or burns when applied to the skin. Excessive consumption of apple cider vinegar may cause low potassium, low blood sugar, low blood pressure and low bone mineral density. Pregnant and breastfeeding women should avoid medicinal use of apple cider vinegar because more research is needed on its effects, according to WebMD.