Obsessive-compulsive disorder (OCD) is a psychiatric disorder; more specifically, it is an anxiety disorder. OCD is manifested in a variety of forms, but it is most commonly characterized by a subject's obsessive, distressing, intrusive thoughts and related compulsions (tasks or "rituals") which attempt to neutralize the obsessions.

The phrase "obsessive-compulsiv e" has worked its way into the wider English lexicon, and is often used in an offhand manner to describe someone who is meticulous or absorbed in a cause. Such casual references should not be confused with obsessive-compulsive disorder; see clinomorphism. It is also important to distinguish OCD from other types of anxiety, including the routine tension and stress that appear throughout life. A person who shows signs of infatuation or fixation with a subject/object, or displays traits such as perfectionism, does not necessarily have OCD, a specific and well-defined condition.

To be diagnosed with Obsessive-Compulsive Disorder, one must have either obsessions or compulsions alone, or obsessions and compulsions, according to the DSM-IV-TR diagnostic criteria. The Quick Reference to the diagnostic criteria from DSM-IV-TR (2000) describes these obsessions and compulsions:

Symptoms may include some, all, or perhaps none of the following:
• Repeated hand-washing.
• Specific counting systems — e.g. counting in groups of four, arranging objects in groups of three, grouping objects in odd/even numbered groups, etc.
        • One serious symptom which stems from this is "counting" your steps, e.g. you must take twelve steps to the car in the morning.
• Perfectly aligning objects at complete, absolute right angles, etc. This symptom is shared with OCPD and can be confused with this condition unless it is realized that in OCPD it is not stress-related. (that's me!)
• Having to "cancel out" bad thoughts with good thoughts. Examples of bad thoughts are:
        • Imagining harming a child, and having to imagine a child playing happily to cancel it out.
        • Sexual obsessions, or unwanted sexual thoughts. Two classic examples are fear of being homosexual or fear of being a pedophile. In both cases, sufferers will obsess over whether or not they are genuinely aroused by the thoughts.
• A fear of contamination; some sufferers may fear the presence of human body secretions such as saliva, sweat, tears, or mucus, or excretions such as urine or feces. Some OCD sufferers even fear that the soap they're using is contaminated. [1]
• A need for both sides of the body to feel even. A person with OCD might walk down a sidewalk and step on a crack with the ball of their left foot, then feel the need to step on another crack with the ball of their right foot. Also, if one hand gets wet, the sufferer may feel very uncomfortable if the other is not.

People who suffer from the separate condition obsessive compulsive personality disorder are not aware of anything abnormal about themselves; they will readily explain why their actions are rational, and it is usually impossible to convince them otherwise. People who suffer from OCPD tend to derive pleasure from their obsessions or compulsions, while those with OCD do not feel pleasure but are ridden with anxiety. OCD is ego dystonic, meaning that the disorder is incompatible with the sufferer's self-concept. Because disorders that are ego dystonic go against an individual's perception of his/herself, they tend to cause much distress. OCPD, on the other hand, is ego syntonic — marked by the individual's acceptance that the characteristics displayed as a result of this disorder are compatible with his/her self-image. Ego syntonic disorders understandably cause no distress (K. Carter, PSYC 210 lecture, April 11, 2006). This is a significant difference between these disorders.

Equally frequently, these rationalizations do not apply to the overall behavior, but to each instance individually; for example, a person compulsively checking their front door may argue that the time taken and stress caused by one more check of the front door is considerably less than the time and stress associated with being robbed, and thus the check is the better option. In practice, after that check, the individual is still not sure, and it is still better in terms of time and stress to do one more check, and this reasoning can continue as long as necessary. (that's my mom!)

OCD is different from behaviors such as gambling addiction and overeating. People with these disorders typically experience at least some pleasure from their activity; OCD sufferers do not actively want to perform their compulsive tasks, and experience no pleasure from doing so.

OCD is placed in the anxiety class of mental illness, but like many chronic stress disorders it can lead to clinical depression over time. The constant stress of the condition can cause sufferers to develop a deadening of spirit, a numbing frustration, or sense of hopelessness. OCD's effects on day-to-day life — particularly its substantial consumption of time — can produce difficulties with work, finances and relationships.

Obsessive-Compulsive Disorder tends to be slightly more common in females than in males. Violence is rare among OCD sufferers, but the disorder is often debilitating and detrimental to their quality of life. Also, the psychological self-awareness of the irrationality of the disorder can be painful. For people with severe OCD, it may take several hours a day to carry out the compulsive acts. To avoid perceived obsession triggers, they also often avoid certain situations or places altogether.

antara simptom yang aneh aku rasa ada kat diri aku yang boleh diconsider as OCD are:
- rename semua lagu dalam pc ikut format nama artis - lagu
- susun pinggan ikut saiz
- lipat kain lap meja
- kaler dan saiz hanger yang sama sangkut baju dalam almari
- perfectly aligning objects at complete, absolute right angles, etc.

looks normal right? kalau tak buat tak senang hati.. risau berminggu-minggu.. related to emotional.. leads to mental illness? whoaa..

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