Learn what can put someone at risk of developing this rare brain disorder that causes dementia.
Disease
Infant jaundice
Learn about this common condition in newborns, especially those born preterm. With close monitoring and light therapy, complications are rare.
Disease
Jaw tumors and cysts
Also called odontogenic tumors and cysts, these typically benign lesions develop in the jawbone or the soft tissues in the mouth. They vary in severity.
Disease
Jellyfish stings
Learn more about prevention and first aid for these painful injuries that are common among people swimming in seawater but are rarely life-threatening.
Disease
Jet lag disorder
Jetting across time zones can take a toll on your body's internal clock. Find out how to cope with fatigue and other symptoms while traveling.
Disease
Jock itch
Jock itch — Comprehensive overview covers symptoms, treatment of this fungal infection affecting more than athletes.
Disease
Juvenile idiopathic arthritis
Learn about this type of arthritis that affects children and can cause growth problems, joint damage and eye inflammation.
Disease
Stevens-Johnson syndrome
Learn more about the causes of this rare disorder of the skin and mucous membranes, its early signs, and whether it's preventable.