Most public discussion of hallucinations stops at the boundary of the body. But the brain also generates perceptions of internal body events — sensations of organs shifting, blood flowing in strange ways, electrical activity in the chest, or foreign objects inside. These are somatic hallucinations (sometimes called coenesthetic hallucinations), and they are among the more difficult symptoms to talk about because they are easy to mistake for medical complaints, and because they shade into the territory of somatic delusions.
Somatic hallucinations are perceptions of internal bodily processes that are not actually occurring, while somatic delusions are fixed false beliefs about the body — and the two often appear together.
What people experience
Common reports include:
- Organs feeling like they are moving, shrinking, or swelling
- Blood flowing in unusual directions or pooling somewhere it shouldn't
- Electrical or vibrating sensations deep inside the chest, head, or abdomen
- The sensation of objects, animals, or substances inside the body
- Sensations of body parts being penetrated, manipulated, or controlled from outside
- The body or parts of it feeling deformed or rearranged
Some of these sensations are described in vague terms ("something is wrong inside me"); others are described with vivid specificity ("my liver is being twisted").
Hallucination vs delusion
The line is worth understanding:
- A somatic hallucination is the perceived sensation itself — the felt experience of something happening inside the body.
- A somatic delusion is the fixed belief about what is happening — for example, that organs are rotting, that an implant is inside the body, or that the body is being controlled by an external force.
The two often appear together. A person may feel a sensation in the abdomen (hallucination) and conclude that an animal is living there (delusion). Treatment usually addresses both, but understanding the distinction helps clinicians ask better questions and helps families interpret what they are seeing.
How common in schizophrenia
Reliable prevalence figures are difficult because somatic hallucinations are often grouped with tactile hallucinations or with somatic delusions in research. Best estimates suggest that some form of somatic experience occurs in 10–20% of people with schizophrenia at some point, with substantial overlap with tactile and visual hallucinations.
The differential diagnosis
Several conditions produce sensations that look like somatic hallucinations:
- Genuine medical conditions. Cardiac arrhythmias, gastrointestinal disease, neuropathy, and many others. The first job of a clinician is to make sure a real medical cause is not being missed.
- Anxiety disorders, particularly panic. Heart-pounding, depersonalisation, and visceral sensations are common.
- Health anxiety. Persistent attention to bodily sensations can amplify them.
- Substance intoxication and withdrawal.
- Migraine and certain seizure types.
- Schizophrenia and other primary psychotic disorders.
How they are evaluated
A new somatic hallucination in someone with schizophrenia is usually approached the same way as any new bodily symptom: a careful medical history, a physical exam, and targeted tests based on the location and quality of the sensation. Once medical causes are reasonably ruled out, the symptom is treated as part of the psychiatric picture, with antipsychotic medication and therapy.
Somatic sensations are accompanied by chest pain, severe shortness of breath, weakness, neurological signs, fever, or unexplained weight loss. These features can point to a treatable medical cause that needs urgent evaluation.
Treatment
Antipsychotic medication is the mainstay when somatic hallucinations are part of schizophrenia, with clozapine sometimes considered for severe or treatment-resistant cases. CBT for psychosis can help people develop a different relationship with the sensations and the beliefs that cluster around them. When somatic hallucinations are intertwined with delusions of infestation or implantation, engagement is often the hardest part because the person is convinced of a physical cause and may resist psychiatric treatment.
Living with somatic hallucinations
People who live with these experiences often describe a few things consistently:
- The sensations are physically real perceptions, even when their cause is in the brain rather than the body.
- The temptation to chase medical explanations is enormous and usually frustrating, with multiple specialist visits that find nothing.
- The sensations often quiet during stable periods on medication.
- Stress, sleep loss, and substance use amplify them.
- A trusted clinician who takes the experience seriously without confirming a delusional explanation is the single most useful relationship.
What helps families
The best approach is the same one that helps with other hallucinations: validate the experience without endorsing the explanatory belief. "I believe you that your stomach feels strange" is different from "yes, there is something living in your stomach." Maintaining engagement with the treatment team while medical explanations are ruled out and while medication takes effect is the practical job. Our piece on talking to someone in psychosis covers more of this language.
The bottom line
Somatic hallucinations are real perceptions of activity the brain is generating internally. They are uncommon, hard to talk about, and easy to confuse with both medical illness and somatic delusions. They are usually treatable when they are recognised, and they almost always benefit from a clinician who can hold the medical and the psychiatric parts of the picture at once.
This article is for educational purposes only and is not medical advice, diagnosis, or treatment. Always consult a qualified mental health professional. If you or someone you know is in crisis, call or text 988 in the US, or your local emergency number.