Quick answer
OCD symptoms fall into two linked types: obsessions (recurring unwanted thoughts, images, or urges causing anxiety) and compulsions (repetitive behaviors or mental rituals done to relieve that anxiety). Common ones include contamination fears with washing, doubt with checking, and taboo intrusive thoughts with mental rituals. They consume time and cause real distress.
Obsessions
Obsessions are the intrusive, unwanted mental events that drive OCD. Common themes include: contamination (fear of germs, dirt, illness, or contaminating others); harm (fear of hurting someone, causing an accident, or being responsible for catastrophe); doubt (did I lock the door, turn off the stove, hit someone while driving?); symmetry and 'just right' feelings; taboo intrusive thoughts (unwanted violent, sexual, or blasphemous images that horrify the person); and relationship or health-focused fears. These thoughts feel distressing and sticky precisely because they clash with the person's values — they're not wishes, they're fears.
Compulsions
Compulsions are what people do to relieve the anxiety obsessions create, or to prevent a feared outcome. They can be behavioral — washing and cleaning, checking (locks, appliances, the body), repeating actions, arranging or ordering, hoarding — or entirely mental: silently repeating phrases or prayers, counting, mentally reviewing events, or reassuring oneself. Reassurance-seeking (asking others, googling) is a very common compulsion too. The defining feature is that they're done to reduce distress or ward off a feared consequence, they give only brief relief, and they feel difficult or impossible to resist.
How symptoms affect life
Beyond the specific behaviors, OCD symptoms share a signature: they're time-consuming (frequently an hour or more a day, sometimes far more), distressing, and disruptive to work, relationships, and daily functioning. People often feel ashamed, especially with taboo-themed obsessions, and may hide symptoms for years. Two things are worth knowing: OCD can present without any visible compulsions (the rituals are all mental — sometimes called 'Pure O'), and the content of the obsessions says nothing bad about the person. If these symptoms sound familiar and are affecting your life, a professional assessment opens the door to effective, specialized treatment.
When to talk to a professional
OCD is very treatable, but it rarely improves on its own — and general talk therapy can accidentally make it worse by becoming a reassurance ritual. Look for a clinician trained specifically in ERP (exposure and response prevention). If intrusive thoughts distress you, that distress is a sign of your values, not your intentions.
This article is for general information only and is not medical advice, diagnosis, or treatment. Always consult a qualified health professional about your situation. If you are in crisis, contact your local emergency number or a crisis line immediately.