Rare diseases · Sign or symptom
Hypomagnesemia
Low blood magnesium levels
HP:0002917
What it means
The concentration of magnesium in the blood circulation is below the lower limit of normal.
Rare diseases that can present with this16
Very common80–99%
3Common30–79%
5Sometimes5–29%
8- Familial isolated hypoparathyroidism due to agenesis of parathyroid gland
- Hyperphenylalaninemia due to tetrahydrobiopterin deficiency
- Immune dysregulation-polyendocrinopathy-enteropathy-X-linked syndrome
- Neuroleptic malignant syndrome
- Pearson syndrome
- Primary intestinal lymphangiectasia
- Pterin-4 alpha-carbinolamine dehydratase deficiency
- Refractory celiac disease
The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.
Part of the broader category
Also called: Decreased magnesium(2+) concentration · Decreased magnesium(2+) level · Decreased magnesium(2+) level in blood · Low blood Mg levels · Reduced magnesium(2+) concentration · Reduced magnesium(2+) level · Reduced magnesium(2+) level in blood
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Start free with EleplanThis page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.