Hallucinations can be frightening, confusing, and deeply disorienting, especially when they interfere with daily life. For individuals experiencing them, it’s not just a fleeting misperception. It can feel as real as any genuine sensory input. There are several different types of hallucinations, and each offers a unique insight into the underlying cause, whether psychiatric, neurological, or trauma-based.¹
At Diamond Behavioral Health, we help people navigate the complex and often isolating experience of hallucinations with compassion, clinical expertise, and evidence-based care. Understanding the types, causes, and treatment options for hallucinations is the first step toward reclaiming stability and clarity.
What Are Hallucinations?
Hallucinations are sensory experiences that occur without any actual external stimulus. They can affect all five senses, though some types are more common than others. These experiences may range from hearing voices to seeing shapes, feeling phantom touches, or smelling odors that no one else notices.¹
It’s also important to differentiate between hallucinations and delusions. When it comes to hallucinations vs. delusions, this is a common point of confusion. While hallucinations involve false perceptions, delusions are false beliefs held despite evidence to the contrary. Understanding the difference helps clinicians make accurate diagnoses and develop more effective treatment plans.¹
The Main Types of Hallucinations
Auditory Hallucinations
The most commonly reported type, auditory hallucinations, involve hearing things that aren’t present, most often voices, but also sounds like music, knocking, or footsteps. These may be internal (a voice in one’s head) or external (as if someone else is speaking).¹ They are frequently associated with schizophrenia and other psychotic disorders, but they can also occur in mood disorders, trauma-related conditions, or severe grief reactions.
Visual Hallucinations
Visual hallucinations refer to seeing things that aren’t there, whether flashes of light, shadows, shapes, or detailed images.¹ People with Parkinson’s disease, dementia, or schizophrenia often report these experiences. Visual hallucinations can be vivid and distressing, especially when they’re combined with paranoia or misinterpretation of surroundings.
In cases of schizophrenia, hallucinations often appear alongside delusions. You can explore more on this in our related post on the types of schizophrenic delusions that frequently accompany perceptual distortions.
Tactile Hallucinations
Tactile hallucinations involve feeling physical sensations without any real cause. Individuals may experience sensations such as bugs crawling under the skin, being touched, or temperature shifts.¹ These symptoms are common in stimulant-induced psychosis (such as methamphetamine use) and certain neurological conditions. They can also co-occur with trauma-based flashbacks or anxiety disorders.
Olfactory Hallucinations
Less common but still clinically significant, olfactory hallucinations are false perceptions of smell.² A person might detect burning, decaying, or chemical odors without any source. These can be linked to temporal lobe epilepsy, brain injury, or conditions like schizophrenia. Though subtle, these hallucinations can significantly impact the quality of life and are often distressing for those who experience them.
Gustatory Hallucinations
Gustatory hallucinations, or false taste sensations, often appear alongside olfactory hallucinations.¹ They can cause someone to taste bitterness, metal, or other odd flavors without food present. While rare, they’re sometimes seen in seizure disorders, brain tumors, or following trauma to the brain or nervous system.
What Causes Hallucinations?
The types of hallucinations a person experiences may point to different underlying causes. Psychotic disorders like schizophrenia are one of the most common sources, especially for auditory and visual symptoms.¹ But other contributing factors include:
- Substance use or withdrawal (especially hallucinogens, stimulants, alcohol)
- Neurological conditions like epilepsy, Parkinson’s disease, or dementia
- Brain injuries, tumors, or lesions affecting sensory processing areas
- Sleep deprivation or sensory deprivation
- Severe anxiety, grief, or trauma
It’s worth noting that trauma-related hallucinations can occur even in individuals without psychosis. Trauma survivors may re-experience events through visual flashbacks, hear voices tied to past abuse, or feel physical sensations related to past trauma. These symptoms often arise in complex post-traumatic stress disorder (C-PTSD) and dissociative disorders.
To learn more about how we treat trauma and its psychological impacts, visit our trauma disorders page.
When to Seek Help
Experiencing a single hallucination isn’t always a sign of serious mental illness. However, repeated or escalating episodes, especially those that cause distress or disrupt functioning, should not be ignored. Common red flags include:
- Hallucinations that command harmful actions
- Hallucinations paired with paranoia or confusion
- Functional impairment (can’t work, socialize, or care for self)
- Co-occurring signs of psychosis symptoms like delusions, disorganized thinking, or flat affect
Early intervention leads to better outcomes. Our clinicians can help determine whether hallucinations stem from a psychiatric condition, substance use, or a medical cause, and guide treatment accordingly.
How We Treat Hallucinations at Diamond Behavioral Health
As a trusted mental health treatment center, we specialize in identifying the root cause of hallucinations and building a care plan that addresses the full picture, psychological, biological, and emotional.
Our treatment approach may include medication management for conditions such as schizophrenia, bipolar disorder, or seizure-related disorders. We also incorporate psychotherapy, using methods like cognitive-behavioral therapy (CBT) and trauma-focused interventions to help individuals process and reframe their experiences. When hallucinations are connected to substance use, we provide integrated dual diagnosis treatment to address both challenges simultaneously. Depending on the severity of symptoms and the level of support needed, clients may receive either residential or outpatient care.
We prioritize personalized, trauma-informed care that promotes safety, dignity, and long-term recovery.
Take the Next Step Toward Clarity
Types of hallucinations may vary, but the impact on daily life can be profound, no matter what form they take. At Diamond Behavioral Health, we provide expert clinical support for individuals experiencing sensory distortions, whether linked to psychosis, trauma, or complex PTSD.
Learn more about our approach on the psychotic disorders program page, or reach out today through our contact form or by calling 844-525-2899. We’re here to listen and help.
Sources
- Cleveland Clinic. Hallucinations: Types, Causes & Symptoms. https://my.clevelandclinic.org/health/symptoms/23350-hallucinations. Accessed June 2025.
- National Center for Biotechnology Information. MedGen Concept: Hallucination. https://www.ncbi.nlm.nih.gov/medgen/107782. Accessed June 2025.