Magnesium is a vital mineral that supports more than 300 biochemical functions in the body—from producing energy to maintaining muscle and nerve health, regulating mood, and strengthening bones.

Yet despite its importance, magnesium deficiency is surprisingly widespread. Poor diets, depleted soils, and certain medical conditions often leave people unknowingly running low on this essential nutrient.

Here are 14 early warning signs that your body might be running dangerously low on magnesium:

1. Muscle Cramps or Twitches
Low magnesium can cause involuntary muscle spasms, like leg cramps, eyelid twitches, or painful “charley horses.”

2. Constant Fatigue
Since magnesium helps generate cellular energy, not having enough can leave you feeling drained, even after rest.

3. High Blood Pressure
Magnesium relaxes blood vessels, so low levels can contribute to elevated blood pressure—even in otherwise healthy people.

4. Irregular Heartbeat
A deficiency can disrupt your heart’s electrical signals, leading to fluttering, palpitations, or skipped beats.

5. Anxiety or Mood Swings
Magnesium helps regulate calming neurotransmitters like GABA. Without enough, stress and irritability can spike.

6. Insomnia or Trouble Sleeping
Magnesium supports melatonin production and relaxation. If you struggle to fall or stay asleep, a lack might be to blame.

7. Frequent Headaches or Migraines
Magnesium helps control blood flow and inflammation. Low levels can lead to recurring headaches or intense migraines.

8. Bone Pain or Weak Bones
Working alongside calcium and vitamin D, magnesium is key for bone health. A deficiency can lead to pain, fractures, or brittle nails.

9. Constipation
Magnesium helps move things along in your digestive tract. Too little can slow digestion and cause hard, infrequent stools.