Conventional doctors don't. Naturopathic doctors do. (They will do you one better actually, they'll actually take the medication before you take it). IN MY OPINION, the conventional doctors are taught to treat the symptoms and never to find what's causing it. The usual thing is "you have a headache, they give you aspirin.It doesn't mean that you are aspirin deficient." They are taught to patch things up (for example someone was misdiagnosed with say a brain tumor for over a year because the very first thing some doctor did would probably ask them how long it started which may have been that day and they say, take two aspirin and check them in the morning.) and when they can no longer patch, well its you to
catch. In addition to this, the heads that the doctors and their bosses answer to can fire a doctor for even mentioning "alternative" treatment.