1) Pear is cold and helps to damp. Eating too much will hurt the spleen and stomach, so people who are deficient in cold and afraid of cold should eat less. Pear contains more fruit acid and stomach acid, so it is not advisable to eat more. 2) Pears have diuretic effect, and those who have frequent urination at night should eat less pears before going to bed. 3) Patients with blood deficiency, chills, diarrhea and cold hands and feet should not eat more pears. It is best to cook them before eating them to prevent the symptoms of dampness and cold from getting worse. 4) Pears are high in sugar content and should be used with caution by diabetics. 5) Pear contains a lot of fruit acid, which should not be used with alkaline drugs, such as aminophylline and baking soda. Pears should not be eaten with crabs to prevent diarrhea. 6) To relieve cough and resolve phlegm, sweet pears with high sugar content should not be selected.