Immune system disorders in children can involve an underactive, overactive, or misdirected immune response. Main groups include immunodeficiencies, autoimmune diseases, atopic diseases, and ...

There are currently six eating disorders recognized in the DSM-5: anorexia nervosa, bulimia nervosa, binge-eating disorder, pica, rumination disorder, and avoidant/restrictive food intake disorder.

Sometimes an anxiety disorder feels like worry and ruminating about lots of little and big things. Other times it's focused on a specific phobia, such as a fear of flying or being in social situations ...

The term “rare blood disorders” describes less common conditions that affect blood cells’ ability to function correctly. Myeloproliferative disorders and lymphoproliferative disorders are two types of ...

Obsessive-compulsive disorder (OCD) occurs when obsessions (persistent, unwanted thoughts) trigger anxiety, causing you to repeatedly engage in compulsions (specific behaviors) to find relief. These ...

Where mood disorders can cause temporary or fluctuating changes in mood, personality disorders cause symptoms that remain consistent over time and across a range of situations. For example, bipolar ...

Tic disorders are conditions featuring sudden, non-rhythmic movements or vocalizations. A formal tic disorder diagnosis is determined by tic frequency, duration, and type. Tics are non-rhythmic ...

More than 50 million Americans have a sleep disorder. Insomnia is the most common sleep disorder. Sleep apnea can cause breathing to stop 30 or more times in one hour. More than 50 million Americans ...

Bipolar disorder is a long-term mood disorder characterized by major fluctuations in mood — both high and low — that can impact daily functioning and behavior. Although bipolar disorder is a chronic ...

Hallucinogen persisting perception disorder (HPPD) is a rare medical condition that can cause visual disturbances (sometimes called flashbacks) if you’ve taken hallucinogenic drugs in the past. With ...