How to Manage Overthinking & Intrusive Thoughts

Learn the difference between intrusive thoughts and rumination, and how ACT and IFS therapy can help you respond to distressing thoughts in healthier ways.

Why Understanding Your Thoughts Matters

Many people struggle with distressing thoughts that seem difficult to turn off. Some describe sudden, disturbing thoughts that feel out of character or alarming. Others feel stuck in long mental loops analysing past events or worrying about what something might mean.

Although these experiences are often grouped together, intrusive thoughts and rumination (or overthinking) are actually different psychological processes, although both are thought to contribute to anxiety. Understanding the difference can be incredibly helpful because each tends to respond to slightly different therapeutic approaches.

The encouraging news is that evidence-based approaches such as Acceptance and Commitment Therapy (ACT) and Internal Family Systems (IFS) offer practical strategies for stepping out of these mental traps and building a healthier relationship with thoughts.

What Are Intrusive Thoughts?

Intrusive thoughts are unwanted, involuntary thoughts, images, or impulses that suddenly enter awareness. They often appear unexpectedly and may feel surprising, distressing, or inconsistent with a person’s values or sense of identity.

Examples of intrusive thoughts can include sudden images of something bad happening, a disturbing idea that feels out of character, or an impulse that seems completely inconsistent with who someone believes they are. These thoughts often feel alarming precisely because they clash with the person’s values.

Importantly, intrusive thoughts are extremely common and are not an indication that someone wants to act on them or that they reflect a person’s character. The distress usually arises from how the thought is interpreted. When people start questioning why the thought appeared or what it might mean, the mind can shift into rumination.

What Is Rumination or Overthinking?

Rumination refers to repetitive, prolonged thinking about distressing topics, usually focused on analyzing causes, consequences, or hypothetical scenarios. Instead of appearing briefly and disappearing, rumination tends to keep the mind cycling through the same questions or possibilities.

People who are ruminating might replay conversations repeatedly, analyse why they had a certain thought, question what that thought might mean about them, or attempt to mentally solve uncertainties that cannot actually be resolved.

Although rumination often feels like problem-solving, it rarely leads to useful answers. Instead, it tends to increase anxiety and emotional distress because the mind keeps returning to the same unsolvable questions. Over time, rumination can also make intrusive thoughts feel more threatening or meaningful than they actually are.

The Key Difference Between Intrusive Thoughts and Rumination

A helpful way to understand the difference is to think of intrusive thoughts as mental events and rumination as the mind’s response to those events.

Intrusive thoughts typically occur suddenly and involuntarily. They are brief mental experiences that appear automatically and often feel surprising or unwanted. Rumination, by contrast, is a process that involves repeatedly engaging with thoughts, analysing them, and trying to figure them out. Instead of passing quickly, rumination keeps the mind locked onto the same topic.

In many cases, the cycle unfolds in a predictable way. A distressing intrusive thought appears, which triggers anxiety or discomfort. The mind then attempts to make sense of the thought through analysis and questioning. This rumination increases emotional distress and keeps attention focused on the thought, which can make additional intrusive thoughts more likely to appear.

Breaking this cycle usually involves changing how we respond to thoughts rather than trying to eliminate them altogether.

How ACT Helps With Intrusive Thoughts and Rumination

Acceptance and Commitment Therapy (ACT) focuses on changing our relationship with thoughts rather than trying to control or suppress them. ACT recognises that the mind naturally produces all kinds of thoughts, including strange or distressing ones.

One core ACT skill is cognitive defusion, which helps people step back from thoughts instead of getting entangled in them. When someone becomes fused with a thought, it can feel like the thought is literally true or deeply meaningful. Defusion creates distance so that thoughts are seen more simply as mental events.

For example, instead of thinking, “This thought means something is wrong with me,” a person might practise noticing, “I’m having the thought that something is wrong with me.” This subtle shift helps reduce the emotional power of the thought.

ACT also emphasizes acceptance, which means allowing thoughts to come and go without struggling against them. Research shows that attempts to suppress thoughts often make them return more frequently. When people stop fighting the thought, it often loses intensity over time.

Another key ACT process is present-moment awareness. Mindfulness skills help individuals notice when their mind has become pulled into rumination and gently redirect attention to the present. ACT then encourages people to focus on values-based actions, meaning they continue moving toward what matters in their lives even when difficult thoughts are present.

How IFS Helps With Intrusive Thoughts and Rumination

Internal Family Systems (IFS) provides another helpful framework for understanding distressing thoughts. In IFS, the mind is seen as containing different parts, each of which is trying to protect the person in some way.

From this perspective, intrusive thoughts and rumination often come from protective parts that are attempting to prevent harm or anticipate problems. For example, a protective part may generate intrusive warning thoughts in an effort to keep someone safe. Another part may engage in rumination in an attempt to analyze situations and prevent future mistakes.

IFS therapy helps people develop awareness of these parts and learn to unblend from them. Unblending means recognising that a thought or reaction is coming from a part of the mind rather than representing the whole self.

Instead of reacting with fear or self-criticism, a person might notice, “A worried part of me is having that thought.” This creates space between the individual and the thought while also allowing curiosity about the protective role the part is trying to play.

IFS also emphasises approaching these parts with compassion and curiosity rather than judgement. When protective parts feel understood and supported, they often become less reactive. As a result, intrusive thoughts and rumination may naturally decrease.

Why These Approaches Work

Both ACT and IFS highlight an important psychological insight: the main difficulty is usually not the presence of thoughts themselves, but the struggle with them.

When people spend large amounts of time analyzing, fighting, or attempting to control their thoughts, the mind can become increasingly stuck. Learning to observe thoughts with greater distance and compassion often allows them to pass more easily.

Intrusive thoughts may still appear occasionally, but they lose much of their emotional impact. Rumination also becomes easier to interrupt because people learn to recognise when the mind has slipped into an unhelpful thinking loop.

If intrusive thoughts or overthinking are interfering with your daily life, working with a therapist trained in ACT or IFS can help you develop practical tools for responding differently. Learning to step out of mental loops can create greater clarity, emotional balance, and psychological flexibility—and we invite you to contact us today if you would like support in building these skills.

Frequently Asked Questions

Are intrusive thoughts normal?
Yes. Most people experience intrusive thoughts from time to time. What typically causes distress is not the thought itself but the meaning people assign to it or the amount of attention it receives. People with OCD tend to assign much greater meaning to a thought.

Why do intrusive thoughts feel so disturbing?
Intrusive thoughts often contradict a person’s values or identity. Because of this mismatch, they can feel alarming even though they do not reflect a person’s intentions.

Is rumination the same as problem-solving?
No. Effective problem-solving usually leads to decisions or actions. Rumination tends to cycle through the same questions repeatedly causing increased anxiety without producing useful solutions.

Can mindfulness stop intrusive thoughts?
Mindfulness does not usually eliminate thoughts altogether. Instead, it helps people notice thoughts without becoming caught up in them, which reduces their focus or emotional impact.

Can therapy help with chronic overthinking?
Yes. Evidence-based therapies such as ACT and IFS are specifically designed to help people change how they respond to intrusive thoughts and rumination so that these experiences become less overwhelming.

References

Newby, J. M., & Moulds, M. L. (2012) .A comparison of the content, themes, and features of intrusive memories and rumination in major depressive disorder. British Journal of Clinical Psychology, 51(2), 197–205.

Papageorgiou, C., & Wells, A. (2004). A conceptual review of rumination and depression: The role of metacognitive beliefs. Clinical Psychology Review, 24(7), 761–781.

Watkins, E. R. (2008). Constructive and unconstructive repetitive thought. Psychological Bulletin, 134(2), 163–206.

Prepared by Dr. Jennifer Barbera, PhD, Registered Psychologist

Dr. Jennifer Barbera PhD, C. Psych is a licensed psychologist with over 25 years of counselling experience. She has extensive clinical expertise supporting individuals and couples with anxiety, trauma, depression, addiction, and relationship challenges. Her work combines evidence-based approaches with practical strategies to help clients build resilience and improve well-being.[/vc_column_text][/vc_column][/vc_row]

Intrusive thoughts VS rumination