Chronic fatigue syndrome can make it difficult for individuals to remain upright for an extended period. Medically, this is known as orthostatic intolerance. When blood pressure drops as someone stands up, the body is not capable of stabilizing itself, leading to dizziness or lightheadedness. Because blood flow does not reach the head quickly enough, people need to sit or lie down to alleviate these symptoms. Some people with orthostatic intolerance also experience headache, weakness, nausea, or sweating when they stand up.

This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.