What Causes Paranoia Or Paranoid Thoughts?

Paranoia can be linked to a number of mental health disorders and to possible changes in brain structure and chemicals. Knowing more about paranoia and ways to address paranoid thought patterns could help people who are living in this elevated state of anxiety and fear. 

What is paranoia?

According to the American Psychological Association, paranoia involves thoughts or behaviors “relating to or exhibiting extreme distrust or suspiciousness.” Paranoid thinking can make someone believe that other people are intentionally trying to hurt them, manipulate them, exploit them, or deceive them, even when they don’t have evidence to support these beliefs. Note that paranoia is not the same as justified suspicion. Instead, it’s usually a level of suspicion that’s out of proportion to the situation and is supported by false beliefs instead of real evidence.

Common symptoms of paranoia

A person living with paranoia might experience emotional and cognitive symptoms like:

• Irrational beliefs about being watched or conspired against
• Preoccupation with these beliefs
• Negative thoughts about those around them
• A sense of being betrayed by those around them
• Emotions like anger and fear

Common behavioral and social paranoia symptoms can include:

• Intense mistrust of others due to paranoid feelings
• A tendency to assign negative meanings to other people’s remarks that are actually benign
• Hypervigilance
• Interpersonal sensitivity and defensiveness
• Being argumentative
• Trouble relaxing due to believing there’s a constant threat

How paranoia can affect well-being

Persistent paranoid thoughts can cause significant disruption to various aspects of functioning and mental well-being. It can lead to a sense of isolation, which may eventually evolve into self-loathing, low self-esteem, and hopelessness. These feelings can also lead to the development of other mental health conditions, like depression, anxiety, and substance use disorders. 

The mental strain and stress of paranoia may also lead to a number of physical health consequences—particularly when left unmanaged or untreated over the long term. Some of these include:

• High blood pressure
• An increased risk of heart attacks and stroke
• Cardiovascular concerns
• Sleep disturbances
• Weight gain or loss
• A weakened immune system
• Fatigue
• Unexplained aches and pains

If you’re experiencing the strain of persistent mental health symptoms, help is available. A licensed online therapist can offer convenient support via phone, video, or live chat.

Types and severity levels of paranoia

Paranoia can exist on a spectrum from mild to severe. Types of paranoia may be situational or persistent, depending on the underlying cause and the options a person has for support. 

Stress and life circumstances might cause short-term paranoia from time to time, which can resolve on its own and may not be cause for concern. In contrast, paranoia symptoms that are persistent, hard to control, and start disrupting everyday functioning and relationships can be more serious, potentially indicating an underlying cause that needs to be addressed. You can seek professional support for any level of paranoia, but it may be especially important for moderate to severe symptoms.

How paranoia shows up in daily life

A person with mild paranoia may sometimes be suspicious of those around them, but symptoms may fade over time, or the person may accept reassurance. Mild paranoia doesn’t usually impact daily functioning in significant ways unless it worsens.

In contrast, a person with moderate to severe paranoia might experience paranoid thoughts for large parts of each day, most days. These feelings can make it difficult or impossible to go to work or school, run errands, care for children, or do other necessary tasks of daily life. As a result, a person may become financially unstable and unable to care for themselves.

Symptoms often make a person mistrust those around them, even close friends and family members. This effect could lead to strained relationships and isolation, which may exacerbate symptoms. 

What causes paranoia?

It’s not known exactly what causes paranoia in the brain. Researchers believe that, as with other mental health conditions, it may occur due to a complex combination of factors. Learning more about them can help you understand how this symptom might come about.

Biological factors

The amygdala—the part of the brain known as the “fear center,” responsible for the body’s fight-or-flight response—may be more easily activated in people with tendencies towards paranoia, potentially resulting in perceiving threats where none exist.

Increased amygdala activity can combine with lower activity in the prefrontal cortex to produce paranoid thinking. The prefrontal cortex is responsible for helping us make decisions and use logic and reason—abilities that may not be as prominent in people with paranoia, as they may tend to have trouble rationally assessing situations.   

Finally, some people with paranoia may have higher concentrations of certain neurotransmitters. For example, high levels of dopamine may cause distortions in how a person sees the world around them, which could sometimes result in paranoia. Note that some of these brain chemistry and brain structure differences may have a genetic component.

Stress

Stress—particularly when chronic—can have a range of negative impacts on both the body and the brain. It activates the fight-or-flight response, which can heighten overall alertness and potentially predispose someone towards thought patterns that focus on fear. Chronic stress—such as due to environmental factors like poverty, housing instability, racism, and others—could lead the brain to start assessing every situation in terms of threat level, which could make the interactions of everyday life seem menacing and cause paranoia to develop. 

Medical conditions

In some cases, paranoia develops as a symptom of an underlying medical condition, such as:

• Dementia
• Parkinson’s disease
• A brain tumor
• A brain injury
• HIV
• Syphilis

Seeing a doctor to rule out any underlying medical causes of this symptom is usually a recommended first step for those experiencing paranoia.

Trauma

Traumatic experiences can cause changes in the way the brain processes and responds to emotions and codes and stores memories. These changes could lead to hypervigilance, in which a person remains in a constant state of tension, ready to react to potential danger. Over time, hypervigilance can nurture patterns of paranoid thinking. Working with a compassionate online therapist may help you process past trauma in a healthy way over time.

If you are experiencing trauma, support is available. Please see our Get Help Now page for more resources.

Mental health conditions

Paranoia can be associated with a number of mental health conditions in the general population, particularly paranoid personality disorder (PPD). PPD is a personality disorder characterized by long-term patterns of distrust and suspicion of others—not just legal authorities and healthcare providers but even friends, neighbors, and loved ones.

Other mental health conditions that may be associated with paranoia include:

• Post-traumatic stress disorder (PTSD): Traumatic experiences can lead to paranoia as a defense mechanism. 
• Substance use disorders: Any disorder involving a person regularly misusing a mind-altering substance could lead to changes in the brain that may make paranoia more likely. Stimulants, particularly methamphetamine, may have a higher probability of such effects according to the Substance Abuse and Mental Health Services Administration (SAMHSA).
• Bipolar disorder and other mood conditions: The manic episodes associated with some types of bipolar disorder can lead to elevated levels of paranoia. In some cases, other mood conditions like depression may also be associated with this symptom.
• Schizophrenia: Historically, the schizophrenia diagnosis was divided into subcategories, one of which was referred to as “paranoid schizophrenia.” Now, paranoid delusions are considered a common symptom of the singular disorder of schizophrenia. 
• Delusional disorder: With delusional disorder, a person experiences delusions, or beliefs that are not rooted in reality and that they can’t be reasoned out of. Persecutory delusions, or the belief that one is going to be harmed, can result in paranoia. 
• Anxiety disorders: Some research suggests that long-term worry and anxiety could be a risk factor for paranoia.

How paranoia is diagnosed

When diagnosing paranoia, a doctor or mental health professional will usually conduct a clinical assessment, taking into account the person’s recent behaviors, mental health and medical history, and family history. If the individual themselves isn’t able to share this information or has been known to avoid doctors due to paranoia symptoms, a trusted family member may be asked to help. A doctor may propose a physical examination and various tests to rule out any underlying medical causes. Once paranoia is diagnosed and any underlying causes are identified, the provider can propose treatment options.

Treating paranoia and reducing symptoms

The way paranoia is treated can depend on its severity and the underlying cause. Meeting with a doctor or therapist may help you understand which approach(es) might be right for your situation. Keep in mind that severe symptoms of paranoia might require hospitalization, especially if they manifest with other symptoms of psychosis. 

Therapy and psychological support

Working with a therapist can be helpful in addressing unwanted or distorted thought patterns. For example, cognitive behavioral therapy (CBT) is a common approach to treating paranoia that involves learning to recognize and then reframe or shift such thoughts. If you don’t feel comfortable working with a therapist one on one, you might also explore options for support groups. 

Medication options

If a person experiencing paranoia receives a diagnosis, such as schizophrenia, their doctor may sometimes prescribe antipsychotic medications as part of their treatment plan. Patients are advised to never start, stop, or change their medication without consulting with their doctor or psychiatrist.

Lifestyle and self-help strategies

A lack of healthy habits may worsen paranoia. In addition to seeking professional support when needed, making a few lifestyle changes if possible might help reduce paranoia, such as:

• Getting enough sleep
• Practicing mindfulness
• Avoiding alcohol and drugs
• Eating nutritious meals
• Staying socially connected

Mind UK also suggests a few self-help tips to consider trying, such as keeping a journal of your thoughts, challenging paranoid thoughts, and identifying situations that commonly make you feel paranoid.

Supporting someone with paranoia

If a loved one is showing signs of paranoia, you might gently encourage them to seek professional help without being demanding or controlling, which may make paranoia worse. You might also listen empathetically when they talk to you, validate their feelings without reinforcing their paranoia, and offer reassurance and support.

Caring for yourself can also be important. Seeing a loved one experience paranoid symptoms can be distressing, and practicing self-care and leaning on social support may be helpful for your own well-being.

Finding support for paranoia

Paranoia can be debilitating in a number of ways, but help is available. A mental health specialist can provide treatment options based on your particular situation and needs. Meeting with a therapist for a mental health screening and treatment advice is often a recommended first step for those experiencing mental health symptoms, including paranoia. 

Exploring the option of online therapy

While seeking help can be important, paranoia may sometimes manifest as a distrust of healthcare providers, potentially leading some people to avoid medical treatment. In such cases, online therapy can be a way to meet with a mental health professional in a lower-pressure environment—virtually, from one’s own home—which may help alleviate some fears associated with paranoia. Connecting with a therapist online can also be a convenient form of self-care if you’re busy supporting a loved one who is living with paranoia.

Does online therapy really work?

Research indicates that online therapy may be as effective as traditional in-person therapy in many cases when it comes to addressing a number of mental health concerns, including paranoia. For example, one study suggests that completing a course of online therapy specifically intended to address paranoid thoughts helped to reduce those thought patterns.