MedlinePlus.gov

en español: http://www.nlm.nih.gov/medlineplus/spanish/ 

The National Institutes of Health's website for patients and their families and friends. Produced by the National Library of Medicine, it brings you information about diseases, conditions, and wellness issues in language you can understand.

FamilyDoctor.org

en español: http://es.familydoctor.org/familydoctor/es.html

Health information for the whole family from the American Academy of Family Physicians.

HealthChildren.org

en español: http://www.healthychildren.org/spanish/paginas/default.aspx

Information for parents from the American Academy of Pediatricians.

Centers for Disease Control & Prevention (CDC)

en español: http://www.cdc.gov/spanish/

In addition to its focus on public health, this agency also provides information on numerous conditions and diseases.

Lab Tests

en español: http://www.labtestsonline.es/

Patient-level information on clinical lab testing from laboratory professionals.

National Center for Complementary and Alternative Medicine

en español: http://nccam.nih.gov/health/espanol/

National Institute of Health agency which provides information about complementary health products and practices.

Clinical Trials

A registry and results database of publicly and privately supported clinical studies of human participants conducted around the world.