Generally there is no side effect of eating hawthorn appropriately, but if you eat too much hawthorn, it may cause increase of stomach acid or rise of blood sugar. Hawthorn is rich in vitamins and minerals, etc. Appropriate consumption of hawthorn is beneficial to the health of the body and has no side effects. However, hawthorn contains fruit acid, organic acid and hawthorn acid and other components, if consumed too much, it is easy to stimulate the secretion of stomach acid, which may cause acid reflux, stomach pain, bloating and other gastrointestinal discomfort. Moreover, the sugar content of hawthorn is also relatively high, if often consumed in large quantities on weekdays, it may also lead to the increase of blood glucose level in the organism. Especially for diabetic patients, eating hawthorn need to control the amount, so as not to be unfavorable to control blood sugar.