The Merck Manual
- A look at the cardiac causes, symptoms, signs, diagnoses, prognosis and treatment of orthostatic hypotension and syncope.
- http://www.merck.com/mmpe/sec07/ch069/ch069d.html

Dr.T C Hain
- A look at what causes orthostatic hypotension as well as diagnosing, tests, treatment by way of non-drugs as well as drugs.
- http://www.dizziness-and-balance.com/disorders/medical/orthostatic.html

NINDS Orthostatic Hypotension Information Page
- Information sheet on orthostatic hypotension including the treatment and prognosis.
- http://www.ninds.nih.gov/disorders/orthostatic_hypotension/orthostatic_hypotension.htm

PPP Healthcare International
- Gives general information about hypotension, discussing causes and what other medical conditions may be associated with this.
- http://www.axappphealthcare.co.uk/maia?h=fam_head&f=factsheet_footer&p=consumer/faq_callback&u=fam_utility&n=consumer/health_atoz&t=hypotension_top&b=shared/fact_sheets/hypotension/hypotension

CWRU School of Medicine
- This article discusses orthostatic hypotension with a brief description and details on diagnosing, tips to assist the patient, diet, salt, and medications.
- http://casemed.case.edu/dept/autonomic/anstopic/oh.htm

The Center for Pediatric Hypotension
- Information about the investigation, evaluation, and treatment of adolescents and children with syncope, orthostatic tachycardia, and other forms of chronic orthostatic intolerance including CFS.
- http://www.syncope.org/