It is thought that people with<unk>  have a dysfunction in the release of the chemical dopamine in the nucleus accumbens, the brain's primary reward center. This part of the brain is thought to play a role in pleasurable activities, including laughter, addiction, and music. Additionally, it is thought that depression, drug addiction, high levels of prolactin, low testosterone, and uses of certain medications might play a role in inhibiting dopamine. A spinal cord injury or chronic fatigue syndrome might also occasionally cause this disorder. Age may also be a cause of this disorder. Other causes are infectious diseases like the influenza and as well as cancer. A sudden-onset<unk>  can also be a symptom of sensory neuropathy, which is most commonly the result of pyridoxine toxicity (e.g., from large doses of vitamin B6 supplements). In this case, the<unk>  dysfunction promptly resolves spontaneously once the B6 supplementation is stopped. Increased serum prolactin (PRL) concentration in patients brains from psychiatric medicine can also affect<unk> ity. Psychiatric medicine is known to cause the brain to form more dopamine receptors for the dopamine blocking effect. The normal amount of dopamine released during sex is insufficient to stimulate the larger number of dopamine receptors.
Sexual anhedonia
Musical anhedonia
Emotional lability
Anhedonia
Callous and unemotional traits
Alexithymia
Fear of falling
Automatism 