What is Hallucinogen-persisting perception disorder?

What is Hallucinogen-persisting perception disorder?
Hallucinogen-persisting perception disorder, or HPPD, causes a person to keep reliving the visual element of an experience caused by hallucinogenic drugs. But what do the flashbacks in HPPD feel like, what causes them, and how might they be treated?
A person with HPPD has frequent visual disturbances. They do not relieve any other aspects of a drug trip, only the part that involved vision. The way the flashbacks in HPPD affect a person's vision can be frustrating and may cause anxiety.
This article explores the symptoms and causes of HPPD. It also discusses how a person experiencing HPPD can manage their condition.
What is HPPD?
Unlike the immersive flashbacks that some people have after taking drugs, HPPD flashbacks are purely visual. This means that a person with HPPD just has visual disturbances, such as seeing blurry patterns, size distortion, and bright circles.
These individuals do not relieve any other aspects of the feeling of being on drugs.
HPPD flashbacks are not usually pleasurable, and they can become annoying if they occur frequently or last for a long time. The flashbacks may also cause anxiety.
HPPD does not cause people to have full hallucinations or delusions.
Someone experiencing HPPD is usually aware that it is a visual disturbance and can determine what is real, as a 2012 study explains. This qualifies HPPD visual disturbances as pseudohallucinations.

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