Priority Healthcare Corporation
- Pulmonary hypertension information covering symptoms as well as primary and secondary pulmonary hypertension.
- http://www.phneighborhood.com/

World Symposium on Primary Pulmonary Hypertension
- Recap of the hightlights of this 2003 event. Includes discussion of the pathology, risk factors, and treatments.
- http://www.phassociation.org/medical/Advances_in_PH/Autumn_2003/recap.asp

Austrian Pulmonary Hypertension Self-Help Association
- Features organization details, news, events, patient information, and contact details. [Information in English and German]
- http://www.lungenhochdruck.at/en/00.htm

Persistent Pulmonary Hypertension of the Newborn (PPHN)
- Article by Dennis E. Mayock, M.D., describing the background, diagnosis, and treatment of this disease.
- http://neonatal.peds.washington.edu/NICU-WEB/pphn.stm

eMedicine - Primary Pulmonary Hypertension
- In-depth article detailing the symptoms, diagnosis, and treatment of PPH.
- http://www.emedicine.com/MED/topic1962.htm

eMedicine - Secondary Pulmonary Hypertension
- In-depth article detailing the symptoms, diagnosis, and treatment of SPH.
- http://www.emedicine.com/med/topic2946.htm

Flolan Fashion File
- Photos and descriptions of packs useful for carrying Flolan pumps.
- http://www.users.qwest.net/~heyweird/flofashions/index.html

Primary Pulmonary Hypertension
- Features brief description of the causes, symptoms, and treatment of the disease.
- http://www.cincinnatichildrens.org/heartcenter/encyclopedia/cardiacdiseases/primaryhypertension/

Pulmonary Hypertension Association (UK)
- Features organization background, disease information, research articles, chat room, and message boards.
- http://www.pha-uk.com/

American Heart Association: Pulmonary Hypertension
- Brief description of the cause and treatment of this disease.
- http://www.americanheart.org/presenter.jhtml?identifier=11076

American Heart Association: Primary or Unexplained Pulmonary Hypertension
- Brief explanation of the diagnosis and treatment of PPH.
- http://www.americanheart.org/presenter.jhtml?identifier=4752

PPH Cure Foundation
- A non-governmental funder of medical research into the causes of and therapies for primary pulmonary hypertension. Includes background information, research articles, clinical trials, and patient stories.
- http://www.pphcure.org/

PH Central
- Features medical information, support options, news, events, research, forums and mailing lists, legislative action center, and personal pages.
- http://www.phcentral.org/