This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.
Post #28 answers the question as asked. The question underneath it is different.
What I would tell a new member reading about headache for the first time: the confident posts are not the reliable ones, and the reliable ones are longer.
I read post #31 twice before replying, because I had assumed the opposite.
The most useful posts here describe what was measured, what was changed, and what happened, in that order.
Adding it because I spent an afternoon working it out and nobody should have to twice.
Distinguishing three things in the headache discussion that keep getting used interchangeably: the observation, the proposed mechanism, and the recommendation that gets attached to both.
The strongest argument against my own position on headache, stated as well as I can state it, since nobody else has yet.
Post #32 is right about the mechanism and I think understates the practical bit.
Rapid correction of a genuine abnormality can be more dangerous than the abnormality, which is another reason this belongs in clinical hands.
None of the above is medical advice and I am not qualified to give any.
Following, with nothing to contribute beyond having asked the same thing elsewhere.
Cramping is the symptom most confidently attributed to electrolytes and has the weakest evidence linking it to them.
Orthostatic symptoms: dizziness on standing after lying down can indicate dehydration or electrolyte depletion. Increasing fluids, salt, and potassium usually resolves it.
I would hold that lightly until someone with a larger sample weighs in.
On headache, the part that usually goes wrong is that the question is asked as though it has one answer. It has a range, and the width of the range is the interesting bit.
If you can post the two or three numbers you are working from, several people here will check the arithmetic rather than argue about the conclusion.
Post #39 describes the usual case. This is about the unusual one.
Before the thread moves on from headache — what is the sample size behind the claim? I am not being difficult; I have seen the same figure quoted from an n of four and from an n of four hundred.
I keep a log for headache specifically because my memory of it turned out to be systematically wrong in one direction. Six weeks of notes cost nothing and settled it.
Confirming post #43 from a second method, which matters more than confirming it from a second person.
For anyone finding this later: the short answer on headache is that it depends on one thing, and the rest of the thread is people identifying which thing.
On post #43 — agreed on the reasoning, with one qualification.
Adding salt to food is the intervention most consistently reported as helping and is also the one least likely to cause harm.
A qualification I should have led with rather than closed on.
Picking up post #43: that is the part I would want checked first.
Constipation and hydration: dehydration makes constipation worse. Increasing fluid intake is the first intervention for constipation alongside other measures.
The rule of thumb is fine; the edge cases are where it earns its keep.
I disagree with the framing of headache above, and I think it is a substantive disagreement rather than a terminological one. Setting out why, so it can be checked.
The reasoning depends on an assumption that is doing a lot of work and is never stated. If the assumption holds, the conclusion follows. I do not think it holds generally.
Understood, and I withdraw the assumption I opened with.
Narrowing post #47, because the general version has more than one answer.
Speaking only to headache as I have actually seen it, rather than as it is usually described: the effect is real, it is smaller than the thread suggests, and the variance between people is larger than the effect.
That is a cleaner way of putting what I was circling around.
Answering the question post #49 raises rather than the one it answers.
On headache I would separate what is worth knowing from what is worth acting on. The first list is long and the second is short, and conflating them is how threads get heated.
Where there is a genuine question, a measurement answers it and a supplement does not. Blood tests for the common electrolytes are routine and cheap.
That is all I can say without guessing.
The most useful reply I ever got about headache was a request to state my units. It sounds like pedantry and it has saved me twice.
Picking up post #58: that is the part I would want checked first.
Where a laboratory result exists, quoting it with the reference interval makes the discussion tractable. Without it the thread is guesswork.
Genuinely open to being wrong about this one.
That is consistent with mine, for whatever one more account is worth.