16 month old fell hard when walking and hit forehead on wood floor two days ago. Has a bruise but acting normal since. This morning he woke up with fever, has thrown up and is lethargic. Fever goes up to 103.5 and goes down with Tylenol but goes back up before next dose. Could fever be from head injury?
The history of falling is probably unrelated to the feverishness and lethargy. But pain from the fall could have some relation. Moreover, vomiting even 2 days after a fall raises concerns about head injury. It is likely that he is suffering from a viral infection independent of his fall. If fever does not get controlled with Tylenol, you may give Metal P (metonymic acid) which is more effective in controlling fever. It is better to visit a pediatrician and get him investigated since he is lethargic.