No one really knows what causes internet addiction disorder, although several factors have been noted by mental health professionals as contributors to this condition. One theory concerns the "rush" that some Internet addicts have by logging online, similar to the experience of process addictions such shopping or gambling. People with depression or other mental disorders may use the Internet as a way to self-medicate in the same way substance abusers use drugs or alcohol.
An addiction can be caused from drugs, alcohol, or any other vice a person may have. Many think addiction is a mental disorder.
unknown, its probably not a single gene but instead many
This disorder was identified over a century ago, but its cause is still unknown
The cause of the disorder of written expression in some persons may be due to deficits in visual-motor integration and motor coordination. The cause of this deficit is unknown.
refers to an autoimmune disorder of unknown cause, which causes deposition of inflammatory lesions called granulomas in the central nervous system .
The cause of moyamoya disease is unknown. Possible explanations for the disorder include injuries to the brain, infection, multifactorial inheritance, genetic factors, or other causes
Nicotine is the chemical that causes addiction.
Nicotine
Bipolar Disorder is characterized by heavy mood swings that occur randomly. The exact cause of bipolar disorder is unknown but there seem to be some factors that help trigger bipolar episodes. Some of these causes include differences in neurotransmitters, biological parts, hormones or inherited traits. Also, stress and traumatic events may play a large role in developing bipolar disorder.
Not fully. However, professionals are making great strides towards understanding it. It is already known to be an autism-spectrum disorder and pervasive developmental disorder, but its exact causes are still unknown, and it still cannot be "cured."
Nicotine causes addiction to smoking
Nicotine addiction.