All questions about ME/CFS and long COVID

Why do they feel faint when they stand?

Feeling dizzy, sick or faint when standing up from sitting or lying is a recognised symptom of ME/CFS.

The full answer, with the sources, is in the guide.

Sources

• NHS: ME/CFS, symptoms
• ME Association: What are ME/CFS and long COVID? (summarises the NICE 2021 guideline)
• CDC: Symptoms of ME/CFS

Reviewed 2026-11-09 · next review 2027-11-09