<Tr> <Th_colspan="2"> Rhinorrhea </Th> </Tr> <Tr> <Td_colspan="2"> Labeled cross section of the nasal cavities </Td> </Tr> <Tr> <Th> Specialty </Th> <Td> Otorhinolaryngology </Td> </Tr> <P> Rhinorrhea or rhinorrhoea is a condition where the nasal cavity is filled with a significant amount of mucus fluid . The condition, commonly known as a runny nose, occurs relatively frequently . Rhinorrhea is a common symptom of allergies (hay fever) or certain diseases, such as the common cold . It can be a side effect of crying, exposure to cold temperatures, cocaine abuse or withdrawal, such as from opioids like methadone . Treatment for rhinorrhea is not usually necessary, but there are a number of medical treatments and preventive techniques available . </P>

Where does water from runny nose come from