Drug addiction, also called substance use disorder, is a disease that affects a person's brain and behavior and leads to an inability to control the use of a legal or illegal drug or medicine. Substances such as alcohol, marijuana and nicotine also are considered drugs. When you're addicted, you may continue using the drug despite the harm it causes.

Drug addiction can start with experimental use of a recreational drug in social situations, and, for some people, the drug use becomes more frequent. For others, particularly with opioids, drug addiction begins when they take prescribed medicines or receive them from others who have prescriptions.

Fear or phobia of driving a vehicle may cause a person to feel driving anxiety.

It can result in significant distress and impact someone’s everyday life. A person may experience emotional distress while driving and avoid certain situations on the road or driving in general.

Depressive disorder (also known as depression) is a common mental disorder. It involves a depressed mood or loss of pleasure or interest in activities for long periods of time. Depression is different from regular mood changes and feelings about everyday life.

Past or childhood experience is often the trigger that causes a person to associate small spaces with a sense of panic or imminent danger. Experiences that can have this effect may include: being trapped or kept in a confined place, by accident or on purpose. being abused or bullied as a child.