How Does Mental Health Affect Your Behavior?

Louise Hartnett
Published: 11/10/2026
Authored by: Louise Hartnett, BA
Edited by: Michael Fegan, BA

Conversations about mental health often center around distressing thoughts and feelings, with less focus on how mental health affects behavior. But behavior and mental health are closely linked. Changes in someone’s habits and routines can help reveal emotional difficulties. This isn’t always easy, though, because the changes tend to happen gradually and can look like ordinary behavior.

The connection between mental health and behavior can also work the other way, with certain behaviors maintaining or worsening mental health conditions. Understanding this two-way relationship can help behavioral health care professionals identify patterns that may be maintaining someone’s difficulties. 

This article will explore:

  • How mental health and emotions affect behavior.
  • Behavioral symptoms of common mental health conditions.
  • The behavioral health approach to treatment.
  • Where to find effective treatment for behavior changes.
Woman in therapy discussing her mental health treatment plan
Table of Contents

How Does Mental Health Affect Behavior?

Though experiences like depression and anxiety may feel mostly internal, they can have a big impact on daily decisions and overall behavior. 

This is why professionals don’t only look at emotional symptoms to diagnose mental health conditions. They also look at behavioral symptoms, as these can indicate what’s going on internally.

Mental health conditions influence behavior by impacting things like:

Decision-Making

Our decisions are influenced by values, strategy, motivation, and action. These can be affected by many mental health conditions, including: 

  • Depression.
  • Bipolar disorder.
  • Substance use disorder. 

Some conditions can affect how people evaluate rewards or adapt to changing circumstances, and some lead to people making decisions with less information than they need. These problems with cognition are influenced by various neurotransmitters and neural pathways.[1]

Mood, Energy Levels, Motivation, and Pleasure 

Emotions play a big role in the actions we take every day.[2] Feelings create biases, affecting how we interpret the situations and people we encounter in everyday life. When they become overwhelming, they can impair judgment. 

With depression, changes in the way the brain processes reward can also reduce pleasure and motivation, which is known as anhedonia. Low mood often makes small tasks feel exhausting. These changes can lead someone to stop:[3]

  • Seeing friends.
  • Enjoying hobbies.
  • Going to work.
  • Getting out of bed. 

Threat Perception

Many behaviors are influenced by fear and threat perception. This is particularly common in anxiety disorders, which can involve heightened threat perception and avoidance of situations that feel dangerous.[4] It could mean:[4] 

  • Not eating certain foods.
  • Never leaving the house alone.
  • Never answering the phone.
  • Never doing anything new. 

Self-Confidence and Esteem

Mental health difficulties can harm self-esteem and lead to a wide range of behavioral symptoms that are difficult to detect. Adverse experiences in early life may diminish someone’s self-confidence and create deep-seated beliefs about their value and competence. Poor self-esteem might lead someone to: 

  • Use substances.
  • Avoid making new friends.
  • Put other people’s needs first.
  • Remain in an unsatisfying job or relationship. 

These factors often occur together, combining in different ways to shape behavior. 

How Behavior Influences Mental Health

Mental illness and behavior have a bidirectional relationship, which means that they affect each other. For example, if someone’s mental health leads them to take drugs and alcohol, their symptoms can get worse and create a cycle of poor emotional health and substance use.[5]

Behavioral health approaches look at both directions: psychological factors affecting behavior and the other way round.

Common Examples of Behavioral Changes Due to Mental Health

You may recognize behavioral changes are happening without thinking of those changes as mental health symptoms. For example, you might have a friend who has stopped coming out, or notice that you drink more when you feel stressed. Other changes are less obvious, such as sleeping or eating much more or less than usual.

Behavioral changes like this can point to problems with mental health. A primary care doctor or a therapist can look at whether a change might be a symptom of an underlying condition. The following examples show how mental health affects behavior across several conditions: 

Anxiety Behaviors

Many behaviors can be driven by anxiety and anxiety disorders. Avoidance behaviors are the most common, but there are others, too. Avoidance is a defensive behavior typically used to avoid feelings of threat, humiliation, judgment, and shame.[4] Anxiety can also lead to behaviors like: 

  • Reassurance seeking: Some people feel like they need to constantly ask their friends, family members, or doctors (in the case of health anxiety) if things are okay. 
  • Checking: Some people with anxiety constantly perform checks to relieve tension and fear. For instance, they might check that the door is locked or re-read an email again and again to make sure it’s appropriate before sending it to a colleague.
  • Substance use: Using drugs or alcohol can be another way to relieve anxiety. This can provide some temporary relief, but it can make anxious symptoms worse and become a difficult cycle to break out of. Many substances are both psychologically and physically addictive.

Depression Behaviors

Depression has a significant emotional component involving strong feelings of sadness, hopelessness, guilt, and worthlessness. These intense feelings commonly lead to several behavioral symptoms, such as the following:[3] 

  • Avoiding going out
  • Withdrawing from friends, family, and other opportunities for relationships
  • Stopping hobbies
  • No longer carrying out everyday tasks such as personal hygiene or cooking
  • Having no urge for sex or intimacy
  • Pulling away from work or academic responsibilities

These symptoms can be seen as either caused by the depression (“I’m too sad to see friends”) or an attempt to manage it (“I feel better if I stay at home”). Identifying these beliefs that drive depression behaviors is key to undoing them.

PTSD Behaviors

Behavioral changes after trauma are common, although people often focus more on the physical and emotional symptoms of post-traumatic stress disorder (PTSD). Many people experience feelings of hopelessness, guilt, shame, or terror after traumatic events and often have high levels of anxiety. 

They may also experience significant behavioral changes, which are often an attempt to cope. Some start soon after the event, while others appear months later. Behavioral symptoms of PTSD include:[6] 

  • Avoiding places and people associated with the traumatic event.
  • Using alcohol, drugs, or food to manage overwhelming feelings.
  • Taking risks with unsafe sex or driving.
  • No longer conducting self-care, such as forgoing personal hygiene or exercise.
  • Self-harming or attempting suicide. 

Personality Disorder Behaviors

Personality disorders can also involve significant emotional and cognitive differences. This commonly includes finding it hard to manage your emotions. But they also feature many different behavioral symptoms.[7] 

  • Borderline personality disorder (BPD): Also known as emotionally unstable personality disorder (EUPD), BPD usually involves emotional outbursts and difficulty controlling feelings. Impulsive behaviors can cause frequent relationship conflicts, unsafe sex and driving, and sometimes suicidal behaviors.
  • Paranoid personality disorder (PPD): This condition features high sensitivity to perceived rejections, insults, and setbacks. People with PPD tend to be highly suspicious and combative, perhaps withdrawing from relationships or frequently picking fights to determine someone’s loyalty.
  • Dependent personality disorder (DPD): This condition involves strong abandonment fears and feelings of helplessness. It can cause someone to be overly dependent on others. For example, they may need other people to make decisions, avoid disagreements, tolerate mistreatment in relationships, and never take responsibility.
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What Does Behavioral Health Treatment Involve?

“Behavioral health” is an umbrella term that encompasses mental, emotional, and social well-being, and the behaviors that affect it. The CDC uses the term to cover mental distress, mental health conditions, suicidal thoughts and behaviors, and substance use. Care can involve therapists, psychiatrists, counselors, and peer support workers.[8]

The behavioral approach considers how mental health affects behavior and how behavior affects mental health. To effectively treat people’s behavioral health, professionals explore habits, thoughts, and beliefs, as well as the emotions involved.

Treatment usually starts with a behavioral health assessment of your symptoms, sleep, daily routine, and the behaviors you’d like to change. Behavioral health treatment tends to focus more on practical ways to change behavior and what’s causing it. Some other therapies focus more on underlying feelings and motivations in more depth.[8]

How Behavioral Therapy Works

Behavioral health treatment often uses the following ideas and techniques:[8]

  • Tracking a cycle: Many people experiencing behavioral changes from mental illness will map out the cycle of their symptoms in a behavioral health service. Tracking emotions → thoughts→ decisions → behaviors → emotions is a typical starting point for understanding someone’s difficulties.
  • Some behaviors can make us feel better: Behavioral activation is a technique underpinned by this idea. The person may be encouraged to gradually engage in healthy activities, such as light exercise or social events, to improve mood.
  • Behavioral symptoms have a function: The underlying idea here is that behavioral symptoms of mental health conditions are an attempt to cope with something. Behavioral health approaches look for the function of dysfunctional behaviors (such as getting relief or connection) and suggest healthier alternatives.
  • Thoughts are not facts: Behavioral approaches might use the technique of thought modification to reframe the triggers that can prompt unhealthy behaviors. This can help to challenge deep-seated beliefs and help people think more flexibly.
  • Changing behaviors requires evidence: Exposure work involves gradual exposure to a feared situation. It is often used to improve symptoms of anxiety. The exposure can provide necessary evidence that the source of fear isn’t as dangerous as it feels, helping to change a particular avoidance behavior.[9]

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Explore Support for Behavior Changes at AMFM Mental Health Treatment

How mental health affects behavior varies in many ways. Some adults see changes to their relationships and lifestyle choices, while others withdraw from life entirely. Whatever the severity of your behavioral symptoms, there are various treatment avenues available to you.

At AMFM Mental Health Treatment (A Mission for Michael), our goal is to provide personalized care to everyone who seeks our support. If you reach out to us because your mental health is affecting daily life in a significant way, you will receive a full assessment and treatment plan adapted to your needs. 

We offer an intimate, focused mental health treatment experience for adults in home-like settings that are carefully maintained to be peaceful, comfortable spaces. In addition to residential treatment, AMFM Mental Health Treatment also offers multiple levels of outpatient treatment.

Our locations in California, Minnesota, Virginia, and Washington accept insurance and are in-network with many major providers. To check your insurance coverage for mental health care, simply complete our confidential online verification form.

Call us at 866-478-4383 if you would like to start the admissions process or learn more about how we can support your mental well-being. Our compassionate team is available 24/7 to answer your questions and provide guidance with no obligation.

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At AMFM, we strive to provide the most up-to-date and accurate medical information based on current best practices, evolving information, and our team’s approach to care. Our aim is that our readers can make informed decisions about their healthcare.

Our reviewers are credentialed medical providers specializing and practicing behavioral healthcare. We follow strict guidelines when fact-checking information and only use credible sources when citing statistics and medical information. Look for the medically reviewed badge on our articles for the most up-to-date and accurate information.

If you feel that any of our content is inaccurate or out of date, please let us know at info@amfmhealthcare.com