For allergic cough, you can check for allergens by visiting a dermatology department for a blood test. Based on the results of the test, you can identify the allergens and isolate them to prevent allergic cough. In daily life, pay attention to a reasonable diet. Avoid overly greasy, spicy, or stimulating cold foods. It's beneficial to drink more warm water to boost metabolism, or you can boil some pear syrup, which helps relieve cough and dissolve phlegm. Make sure to rest adequately and avoid excessive fatigue.