muscle cramps or twitches, insomnia, irritability, sensitivity to loud noises, anxiety, autism, ADHD, heart palpitations, angina (a spasm of the arteries), constipation, spasms in the muscles, headaches, migraines, fibromyalgia, chronic fatigue, asthma and kidney stones (which are caused by a calcium-magnesium imbalance); even diabetes and obesity are related to magnesium deficiency.