Forgot to add that too much vitamin D supplementation can also deplete magnesium.
Magnesium is essential to heart health. It helps maintain a normal heart rhythm and is sometimes given intravenously (IV) in the hospital to reduce the chance of atrial fibrillation and cardiac arrhythmia (irregular heartbeat). Dietary magnesium deficiency results in altered heart rhythm, and several studies support the value of IV magnesium in preventing post surgical atrial fibrillation.
Kohno H, Koyanagi T, Kasegawa H, Miyazaki M. Three-day magnesium administration prevents atrial fibrillation after coronary artery bypass grafting. Ann Thorac Surg. 2005 Jan;79(1):117-26.
6. Naito Y, Nakajima M, Inoue H, Hibino N, Mizutani E, Tsuchiya K. [Prophylactic effect of magnesium infusion against postoperative atrial fibrillation] Kyobu Geka. 2006 Aug;59(9):793-7; discussion 798-801. Japanese.
7. Henyan NN, Gillespie EL, White CM, Kluger J, Coleman CI. Impact of intravenous magnesium on post-cardiothoracic surgery atrial fibrillation and length of hospital stay: a meta-analysis.Ann Thorac Surg. 2005 Dec;80(6):2402-6.
Causes of magnesium deficiency:
Lacking magnesium in the diet
Mental stress
Physical stress
Coffee
Sugar
High sodium diet
Alcohol
Cola type sodas
Tobacco
Monosodium glutamate (MSG)
Vitamin B12 deficiency
Sleep deprivation
Mercury (silver coloured amalgam filling normally contains 52% mercury; vaccines; fish)
High perspiration
Medical drugs of all types, especially diuretics, digitalis
Hypothyroidism
Diabetes
Pancreatitis
Arteriosclerosis
Kidney disease/failure
Chronic pain
Loud noises
A high carbohydrate diet
A low carbohydrate diet
A low calorie diet
A high calcium diet (especially too much milk)
Hyperparathyroidism
Malabsorption problems caused by chronic diarrhea or vomiting
Fluoride
High zinc levels
Low potassium levels
Yes, my dose was suddenly dropped from 3 to 2,5 pills. I had never made so great changes suddenly. I though that it may not be good for me. I have been on this dose, sometimes trying to decrease one quarter of pill or increase one quarter. I dont' know what is the best, so I'll stay on 2,5 pills.
When I at first gradually started Thyroxine, I had bad symptoms, when I changed gradually to Armour, I had bad symptoms, and again, when I changed to Thyroid I had bad symptoms. The change to Armour was done during ten weeks. During that time I had both medicines, Thyroxine decreasing and Armour increasing. When I was on mere Armour, I tried two times to use both medicines at the same time, but I think I could not tolerate the combination. I have marked my symptoms to a diary fefore and during the thyroid medication. It is not so easy to treat hypothyroidism as doctors suppose (" one pill thyroxine a day"). It was not earlier than after about three years of the medication ( one year Thyroxine and two on Armour) I found that my cognitive problems had improved, I was no longer fatigued and my mood was good. But, for instance, variable muscle weakness remained. And I was very apt to infections.
I take magnesium citrate when I have leg cramps. Maybe I should take it in every day.
Last year I had many diseases. I had to seek intensively for the treatment of the A-fib for six months. Then it was cured. To have the cholecystectomy was a minor battle. In this year I have been seeking causes for periodic tremors, neck pains and neck and shoulder weaknesses. Such a situation grows up ones strength (Finnish "Sisu").
You might have an entirely different experience taking some thyroxine WITH your Erfa than you had taking it alone. You'd still have all the benefits of the Erfa, but would also get your FT4 to a better level.
So, was your dose lowered due to the A-fib?
If you're worried about your magnesium levels, you might just try supplementing magnesium. Magnesium is water soluble, so what your body doesn't need, it will flush.
It sounds like you have a lot going on...
Just a moment ago I read on Wikipedia that hypercalcemia can cause hypomagnesemia.
I take 1.5 pills in the morning and 1 in the afternoon. Because I sometimes have neck muscle pain and tremor early in the morning they cannot be due to hyper but preferly due to hypo. One time I could on such early morning symptoms sleep again by taking part of the morning dose of Thyroid. Thyroid wouldn't help hyper.
Somebody has supposed to me to take some Thyroxine with Thyroid. This is not a good idea for me, it does not work.
I had many diseases last year, eg. three times sinus infection, two times diarrhea due to antibiotics, mild immunedeficiency, pain in abdomen possibly due to gall stones (cholecystectomia in December). I had respiratory problems (phrenic tightness), atrial fibrillation. Late in the year new symptoms appeared, nausea in the forenoons, weakness and pain in neck muscles and left arm. My ALAT rose intermittently in autumn, proBNP rose high, they both are noprmal now. But I have now hypercalcemia and often hypernatremia etc. etc. I have had some muscle weakness for many years, eg. bladder, legs in 2009, nowadays every now and then neck and left shoulder. I think they are due to hypercalcemia.
So, I had af last year. It may be due to infections or now I think partly due to hypercalcemia, and absolutely it was due to dehydration. I also have low antidiuretic hormone. Yes, I had higher thyroid medication in spring 2010. I felt very well in March apart from abdominal symptoms. Then I got flu and the well feeling was gone. In April I again felt very well, when my Thyroid dose was 3 pills. Then I got the af at the end of April, and the well feeling was totally gone. I had a very bad af for six months. I haven't it no longer.
My situation has been very complicated due to the many diseasesa and disturbances. I don't always know what is a cause of a single symptom. I hope that all my symptoms and disturbances were due to hyperparathyroidism. But it may be too simple a solution.