A delusion is a firmly held belief that is clearly untrue and doesn't change even with strong evidence against it — and that isn't explained by the person's culture or religion. Delusions are a symptom, not a diagnosis: they can occur in several mental and physical illnesses, and they respond to treatment. Families often notice them first.
Everyone holds some mistaken beliefs, and strong faith, cultural or religious beliefs shared by a community are not delusions. A delusion is recognised by being fixed despite clear evidence, being out of keeping with the person's background, and often by how much it preoccupies them and changes their behaviour. A sudden change in beliefs in an older person may be a sign of a physical illness and needs prompt medical assessment.
| Type | Belief |
|---|---|
| Persecutory | Being followed, spied on, poisoned or plotted against — the most common. See paranoia |
| Jealous | A partner is unfaithful, without evidence — can lead to controlling or violent behaviour |
| Grandiose | Having special powers, wealth, talent or a mission |
| Somatic | The body is diseased, infested or deformed despite normal examinations |
| Referential | TV, strangers or random events carry personal messages |
| Erotomanic | Someone, often of higher status, is secretly in love with them |
A doctor first checks for physical causes, delirium and substance use. Treatment for delusions caused by a mental illness usually combines antipsychotic medicine, talking therapy (especially cognitive behavioural therapy for psychosis), and family support. People with delusional disorder often don't see the belief as a symptom, so building a trusting relationship with the doctor matters. Prescribed medicines should not be stopped without medical advice.
Ayurveda describes disturbances of belief and perception within Unmada — derangement of the mind, intellect, consciousness, memory and conduct — and emphasises Sattvavajaya chikitsa (counselling that strengthens the mind), gentle and respectful care, a steady routine and nourishing food. It also recognises intoxicants as a cause. In modern practice these principles complement psychiatric treatment rather than replace it.
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Reviewed against NHS: Psychosis, NCCIH: Ayurvedic Medicine, and Ministry of Ayush pharmacovigilance. These links support education and do not replace individual medical advice.