The possible causes of runny nose and sneezing are as follows: 1. Cold: besides runny nose and sneezing, patients also have symptoms such as sore throat, enlarged tonsils, cough, fever, headache and general muscle aches. In terms of treatment, most of the causes are caused by viral infections, so the main thing is to drink more warm water, pay attention to rest, and appropriately use antiviral drugs such as ribavirin; 2. Allergic rhinitis: patients show nasal itching, nasal congestion on both sides, paroxysmal bouts of sneezing that can occur several times a day, and nasal mucus that is mostly clear water. For the treatment of allergic rhinitis, the first thing is to avoid contact with allergens, and in the choice of drugs you can choose antihistamines such as loratadine and cetirizine, as well as the local use of glucocorticoids in the nose, such as budesonide.