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Intrusive thoughts are insignificant or irrelevant thoughts that occur to a person in any situation. These thoughts usually do not have any meaning, but are frightening and scary. Frequent or excessively intense occurrence of these thoughts may result in obsessive-compulsive disorder (OCD).
Obsessive compulsive disorder
OCD is a neurobiological anxiety disorder. This disorder comprises of extraneous thoughts (obsession) and repetitive behavior (compulsion).
- Obsession: Obsessions are intrusive thoughts, ideas, images, or visuals that pop up in the mind without one’s control. Obsessive thoughts are inappropriate and are capable of making a person feel scared, guilty, anxious, or as if their thoughts are reflecting reality. Persons affected with intrusive OCD often find it disturbing and troublesome, as the thoughts usually involve things that are considered important or valuable.
- Compulsions: These are the repetitive behaviors of a person, as a result of the fear created by intrusive thoughts. The behaviors might be visible (like washing and cleaning) or invisible behaviors such as counting, praying, and repeating certain words for a long time. People with intrusive OCD thoughts repeatedly perform these behaviors until they are convinced that the danger is over.
The behaviors found in intrusive OCD often include frequent cleaning of a body part, storing unwanted objects, arranging objects in a particular manner, counting some items repeatedly, making several confirmations that the door is locked, checking numerous times that the stove is turned off, and seeking reassurance from a person frequently. These disorders are caused by a variety of conditions that may be genetic, neurobiologic, or environmental, and sometimes a result of medications and/or psychotherapy.
Types of Intrusive OCD thoughts
Innumerable types of intrusive thoughts may arise in affected individuals. Some common and frequently occurring thoughts leading to repetitive and compulsive behaviors relate to repetitive checking of one’s actions to avoid contamination, home security systems, avoiding house fires, violent fantasies, avoiding harm to family and loved ones, and arranging things in order to avoid very bad consequences.
Impact of Intrusive Thoughts on OCD
Dr. Debra Kissen, from “the Light on Anxiety Treatment Center” of Chicago, prepared a checklist of the common intrusive thoughts. She chose a set of people not having OCD as a sample, and provided them with a series of questions. The questions were related to violent, sexual, unwanted actions and loss of control. The overall sampled population revealed only a small percentage of them had intrusive thoughts.
However, when the same set of questions was shown to people diagnosed with OCD, about 90% of them reported that they were heavily impacted by intrusive thoughts, and a very high level of distress.
OCD is not only dangerous because of intrusive thoughts, but because one’s responses to those thoughts make it complicated. When a person tries to fight intrusive thoughts that arise in him, the inevitable consequence is that the frequency of the thoughts increases. In other words, the more a person avoids them, the worse it gets.
Causes of Intrusive OCD
Studies of OCD show that it is sometimes caused by the damage to a particular part of the brain known as the basal ganglia. Insufficient supply of oxygen to the brain, neurotoxic agents, and infections caused by bacteria are some reasons for such damage. Repetitive intrusive thoughts can be defined as a state of brain lock that happens to the four parts of the brain. In patients with OCD, these parts are ‘locked together’ due to their overstimulation.
In imaging studies, it has been found that two brain structures that interact with basal ganglia are more expressive in OCD patients. These structures are called the anterior cingulate gyrus (ACG) and the orbitofrontal cortex (OFC). They act to identify errors in the brain circuit. Their coordination with the basal ganglia sheds light on the genesis of OCD.
Formally, there are two theories proposed to explain the interaction of basal ganglia and ACG/OFC. According to the first theory, the damage in the ACG or OFC paves the way for loss of error-detection capability, which allows the brain to increase recurrence of thoughts that lead to OCD. This theory fails to elaborate the reason why people have the feeling of worry and insecurity. The second theory speculates that the occurrence of OCD is due to the result of pressurization of the ACG/ OFC complex leading to the relay of false error messages of to the basal ganglia, producing the feeling of something having gone wrong.
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Last Updated: Aug 23, 2018
Dr. Liji Thomas
Dr. Liji Thomas is an OB-GYN, who graduated from the Government Medical College, University of Calicut, Kerala, in 2001. Liji practiced as a full-time consultant in obstetrics/gynecology in a private hospital for a few years following her graduation. She has counseled hundreds of patients facing issues from pregnancy-related problems and infertility, and has been in charge of over 2,000 deliveries, striving always to achieve a normal delivery rather than operative.
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