 [ Symptoms ] why do children bite their own arms  my six year old just told me that he has been biting his arms at bedtime before falling asleep when i asked him why he said i do not know my brain just tells me to do it  [ Disease ] this itching like symptom is known as post nasal drip the best medicine would be the use of anti allergic combination like levocetirizine and montelukast once daily at night consult your specialist doctor discuss with him or her and take the medicine with consent do steam inhalation regularly for at least 10 days revert back after 10 days to a pulmonologist online   > <link>