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1 Dizzy spell after diarrhea and vomiting as it caused due to dehydration. 2  Stress and anxiety. 3  In high fever. 4  Old age. 5  Weakness after suffering from prolonged illness. 6  Exposure to extreme of cold or heat. 7  Low blood pressure and high blood pressure. 8  Low blood sugar. 9  After heavy menstruation. 10  Meniereâs disease.
Deficiencies in this essential vitamin can lead to a number of neurological problems, including feeling off-balance, and having low blood pressure and decreased blood flow to your brain, says Whitman. â Vitamin B12 deficiency is easy to detect and treat, but is an often overlooked cause of dizziness,â he notes. Ask your doctor about having a simple blood test to check your B12 levels if you're having dizzy spells. Good sources of vitamin B12 include meat, dairy products, and fortified breakfast cereals.