Sneezing and running nose after swimming may be the symptoms caused by cold and flu, allergic rhinitis, vasomotor rhinitis and so on. 1. Cold and flu: If you don’t pay attention to keep warm when you leave the pool after swimming, resulting in cold and flu, you will experience sneezing and runny nose. 2. Allergic rhinitis: If you suffer from allergic rhinitis, such as an allergic reaction to the disinfectant in the swimming pool water, it can lead to constant sneezing and runny nose symptoms. 3. Vasomotor rhinitis: after swimming, encountering cold air stimulation, or irritating odor, sneezing and runny nose can occur. If sneezing and running nose after swimming, which can’t be relieved all the time may also be caused by other reasons, it is recommended that patients go to regular hospitals as soon as possible, be examined and diagnosed by professional doctors, and standardize the medication and treatment according to the doctor’s instructions.