The child caught a cold, also do not have a fever, sometimes old say headache how to return a respon

After the child has a cold, there is no fever, but he will say headache. This is because the virus or bacteria will enter the body when he has a cold, causing contraction or expansion of cerebral blood vessels, causing vascular headaches. In addition, toxic substances may stimulate the nerves in the head, causing neurological headaches.