Low blood pressure is common among people these days and this condition is caused due to faulty nutrition. When you don't include the necessary vitamins and minerals in your daily food and eat a lot of junk food, you'll be more prone to suffering from low blood pressure. Malnutrition is another main cause of low blood pressure. Frustration and prolonged depression can also cause low blood pressure in people. Sometimes extensive blood loss can cause low blood pressure, and gradual or slow bleeding in the bladder, kidneys and gastrointestinal tract can cause instances of low blood pressure in individuals too.