In complicated grief, painful emotions of loss don't improve with time and are so severe that you have trouble recovering and resuming your own life.
Disease
Drug addiction (substance use disorder)
Drug addiction affects your brain and behavior to the point where you can't control your use of legal or illegal drugs, even when you know they cause harm.
Disease
Narcissistic personality disorder
This mental disorder includes an unreasonably high sense of importance, a need for excessive admiration, fragile self-esteem, and troubled relationships.
Disease
Intermittent explosive disorder
This mental health condition involves sudden bouts of impulsive, aggressive, violent behavior or verbal outbursts that cause major distress in life.
Disease
Retinoblastoma
Learn about the symptoms, causes and treatments for this eye cancer that occurs in young children.
Disease
Blocked tear duct
Watery, irritated eyes may happen when your tears can't drain. Learn about this common eye condition that affects newborns and, sometimes, adults.
Disease
Malignant hyperthermia
This rare genetic disorder triggers a severe reaction to certain anesthesia drugs, causing rigid muscles, high fever, fast heart rate and rapid breathing.
Disease
Asthma attack
Learn how to recognize when you need to use quick-relief treatment or get emergency care.
Disease
Kawasaki disease
Learn more about this condition that mainly affects young children and causes swelling, called inflammation, in the walls of the arteries throughout the body.
Disease
Congenital heart disease in adults
A heart condition you're born with may not cause symptoms until adulthood. Learn how adult congenital heart disease is treated and why follow-up care is important.
Disease
X-linked agammaglobulinemia
This immune system condition, found mainly in males, leads to repeat infections that are hard to treat.
Disease
Fever
Medications can lower a fever, but sometimes it's better left untreated. Fever may play a role in helping your body fight off infections.