It is not necessary that every headache has to be tumor [closed]
I think this not a right sentence. Can anyone help me to correct this?
If you want to keep the sentence as close to the original as possible you would at least need to add an article in front of the word "tumor." This would give you "a tumor" or "the tumor." To write it in a more natural way I might say "A headache does not necessarily mean there is a tumor" or "Not every headache means there is a tumor."