In addition, other conditions, such as adrenal insufficiency (Addison's disease), low blood sugar
(hypoglycemia), and in some cases, diabetes, can trigger low blood
Dehydration. When you become dehydrated, your body loses more water than it takes in. Even mild dehydration can cause weakness, dizziness and fatigue. Fever, vomiting, severe diarrhea, overuse of diuretics and strenuous exercise can all lead to dehydration.