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最近我常常会莫名其妙的头疼
I've encountered this sentence and I'm wondering why there's 会 used here. Would this sentence be correct without 会?
Would this sentence be correct? 我常常头疼
Would this sentence be correct? 我头疼
I'm asking because my first thought about speaking about headache would be to use 有. So would this sentence be correct? 我有头疼
I'm wondering why there's 会 used here.
会 in here mean always. I'm always getting headaches.
Would this sentence be correct? 我常常头疼
Yes, it is correct
Would this sentence be correct? 我头疼
Yes, it is correct
So would this sentence be correct? 我有头疼
Incorrect. You can't use 有 in this sentences. If you want to use it, the correct should be 我刚刚有头疼
头疼 in 我头疼 is a verb
头疼 in 我有头疼 is a noun
[最近][我][常常][会][莫名其妙(地/的)][头疼]
[recently][I][often][would][mysteriously][having headache]
"莫名其妙(地/的)" is an adverb, therefore "头疼" here is an intransitive verb
'会' means 'would'. You can omit it in this sentence
~
[最近][我][常常][有][莫名其妙的)][头疼]
[recently][I][often][have][mysterious][headache]
'有' is a verb; '莫名其妙的' is an adjective phrase, therefore, 头疼 is a noun.
"会" in the sentence is an 助动词 (auxiliary verb), which means 表示有可能实现 (be possible to achieve). See the definition in 百度百科。例子：如果你考试题都会(known well)做，你就不会(possible to)头疼。
As you see, 会 implies uncertainty. So that see the following:
我头疼。Yes, you have headache, right now. By the way, this is actually 我(的)头疼 with 的 omitted.
我常常头疼。Yes, you have headache, always. By the way, this is actually 我常常(感到)头疼 with 感到 omitted.
我常常会头疼。This one is almost interchangeable with the previous one, but not as confident, because there is an implication of possibility. For example, "Dad, 我头疼，不想写作业了"，or "Doctor, 我常常头疼，给我开药", or "Whenever I saw the face of Mr. Trump, 我就常常会感到头疼"。You see the difference? Because of the possibility, it is often used with other word implicating uncertainty. For example, 我的头常常会感到有些/若有似无的/莫名其妙的疼。It is pretty intuitive to compare "会" and "不会" with possible and impossible.
我有头疼 is awkwardly correct in grammar if you consider 头疼 as headache which is a noun. However, Chinese has some set structures, "头疼" is not something you can "有"。You should say you "感到头疼", or you 有/患有 some "病/症/疾" instead. You can say, 我感到头疼/头晕/头胀，我有头疼的毛病，我有头痛之疾，我有痴呆症。Without the 感到 or 病/症/疾, those are not Chinese convention, though still understandable.
There's no use trying to unlock the door, it will not open.
will here describes a objective present state (the door can't be opened), and 会 in your sentence acts exactly the same.
According to Xiandai Hanyu Cidian (现代汉语词典, Modern Chinese Dictionary), "头痛" (or "头疼") is an adjective, so I suppose that "最近我常常会莫名其妙的头疼" has left out a verb "感到 (feel)". Its full form ought to be
最近我常常会莫名其妙地感到头疼。
(P.S. You should use 地 in this sentence instead of 的, see Differentating De.)
We usually do NOT use "有 (have)" for 头疼, for it's an adjective.
Common verbs for discomforts:
最近我常常会莫名其妙的头疼
With 会, it adds a bit certainty. We can probably use "would" to interpret here. It's more perspective or subjective.
最近我常常莫名其妙的头疼
Without 会，the sentence states the fact that the headaches often occurred during these days. It's more factual.
However the nuance above is very subtle. We can use them interchangeably in practice. No one would care about it.
有头痛 sounds more like the universal 有 in Taiwanese dialect. E. g. 你吃饭了吗？ 我有吃饭啊。
