Tetrahydrobiopterin Deficiency is a rare genetic disorder that affects the production of a substance called tetrahydrobiopterin (BH4). It is not contagious and cannot be transmitted from person to person. This condition is caused by mutations in specific genes and is inherited in an autosomal recessive manner. Tetrahydrobiopterin Deficiency can lead to various health problems, including neurological and psychiatric symptoms. Early diagnosis and treatment are crucial to manage the symptoms and improve the quality of life for individuals with this condition.