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 ...

The theory of types of borderline personality disorder (BPD) is controversial. There is some debate over whether there are various types and what those types may be. BPD is a mental health condition ...

Lymphoproliferative disorders are a group of diseases that cause an uncontrolled production of lymphocytes, a type of white blood cell. Examples include non-Hodgkin’s lymphoma and certain leukemias.

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 ...

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

People with Bipolar I disorder have full-blown manic attacks and deep, paralyzing depressions. A World Health Organization survey found the prevalence rate of bipolar I disorder to be 0.6 percent.

Hyperarousal plays an important role in mental disorders. It influences the severity of insomnia, depression, anxiety, post-traumatic stress disorder (PTSD), and ADHD. Yet it is striking that ...

Multiple sclerosis (MS) is a chronic, often disabling condition that affects the central nervous system, disrupting communication between the brain and body. It’s largely thought to occur when the ...

Functioning brain cells need a functioning system for picking up the trash and sorting the recycling. But when lysosomes, the cellular sanitation machines responsible for those tasks, break down or ...