Dr. Todd Richard Callister MD

What is autism?Autism or autism spectrum disorder (ASD) is a medical condition in which a person has challenges with public behavior, speech, and non-verbal communication. Autism is a life-long developmental disability, and it affects people how people perceive the world and how they interact with...

Depression is a mental illness that consumes individuals, leaving them feeling helpless, hopeless, and sometimes useless. It can be caused by life experiences such as loss of a family member or mental trauma in an individual's life.Depression can occur to anyone, and for a vast majority affected,...

Depression is usually signified by extended moods of sadness and a generally low mood even when events occur that should normally lift someone’s spirits. Patients generally ignore all positive stimuli, preferring to remain in a cocoon irrespective of external circumstances. At one stage, the loss...

Chronic Obstructive Pulmonary Disease (COPD) is a progressive disease that still does not have a cure. The World Health Organization predicts that COPD will become the fourth leading cause of death worldwide by 2030. The predominant cause for COPD is tobacco smoking. Most symptoms are irreversible,...

Schizophrenia is a serious mental disorder involving a breakdown that drastically affects how a person thinks, feels, and behaves. The disorder has five subtypes, one of which is disorganized schizophrenia. Its very name implies the typical and predominant characteristics by which it is identified:...

Hallucinations are when you perceive something in the absence of an external stimulus. For example, you may hear someone speaking to you even when there is no one around you within your hearing distance. Hallucinations are not just hearing things; it could be of different types. This article is...