Her mother suffered from undiagnosed and untreated depression. Addison's disease may be the only manifestation of undiagnosed celiac disease. In animals, gastroenteritis is usually undiagnosed because most astrovirus infections are asymptomatic. The disorder can result in death if undiagnosed or left untreated. An autopsy revealed a previously undiagnosed congenital heart defect. The captain suffered from an undiagnosed severe sleep apnea. There is evidence that most cases remain undiagnosed and untreated. A1AT deficiency remains undiagnosed in many patients. Non union can also occur from undiagnosed or undertreated scaphoid fractures. The disease is often undiagnosed in adults. Pheochromocytoma may go undiagnosed or undetected for multiple reasons. Addison's is often undiagnosed because early symptoms are vague and easily mistaken for other conditions. Mendelson's 1982 study showed that alexithymia frequently presented in people with undiagnosed chronic pain. Hambly speaks freely of suffering from seasonal affective disorder, which was undiagnosed for years. Suffering from undiagnosed dyslexia, he experienced problems at school.