Hi dr., if there is just headache and pain and it is getting better and none of any other symptoms. does he still need to call for an investigation? thanks?

I am sorry that you have to deal with headache. Headache is a very common complaints that happens to a lot of people in their life time. So usually headache does not require any investigation. Having said that, I have also to caution you that headache may be the first symptom of a bigger problem and should not be ignored, especially in the elderly.