Symptoms of possible magnesium deficiency syndrome found when blood serum levels are below 0.9 mmol/L Mg serum include: abdominal pain, arrhythmias, asthma, ataxia, attention deficit hyperactivity disorder (ADHD), chronic fatigue syndrome (CFS), circulatory disturbances (arteriosclerosis, cardiac infarction, stroke), cluster headache, confusion, cramps, depression, diabetes mellitus, epilepsy, hypertension, migraine, neuro-vegetative disorders, osteoporosis, Parkinsonism, preeclampsia, stress dependent disorders, tinnitus, tremor, weakness

Examine the Conclusions section for this list of magnesium deficiency symptoms. See the Full text article here: DH Liebscher, DE Liebscher. About the Misdiagnosis of Magnesium Deficiency. Journal of the American College of Nutrition, Vol. 23, No. 6, 730S-731S (2004).