After a cold, the patient’s body resistance decreases, which can easily induce allergic rhinitis. Moreover, in the case of cold, the mucous membrane of the turbinates of the patient’s nose will be obviously hyperplastic and congested, and the nasal congestion will easily induce the clinical symptoms of allergy. Therefore, patients must exercise more to strengthen their resistance and avoid colds. At the same time, you can consider applying anti-allergy drugs for symptomatic treatment of clinical symptoms, such as montelukast sodium tablets or epalrestine tablets, and also paracetamol. Patients can also add anti-cold medications after catching a cold, such as cold and fever granules, Lianhua Qingfei capsule, Four Seasons cold and flu tablets, etc. The clinical symptoms of patients will be improved after symptomatic treatment. Patients must avoid contact with allergens, usually can wear a mask, active treatment will certainly be improved.