Thyroid disease in cats is linked to heart disease and a fast heartbeat in conjunction with any other symptoms of thyroid problems is cause for a trip to the vet. Once the hyperthyroidism is treated, your cat's heart rate should return to normal.
Stress reaction â some studies have found that paranoia is more common in people who have experienced severe and ongoing stress â for example, prisoners of war. How stress can trigger paranoia is unclear.
Chronic stress may lead to psychotic symptoms (hallucinations, delusions), either in the context of post-traumatic stress disorder or depression. In these conditions, when psychosis is present, there are abnormalities in the hypothalamic-pituitary-adrenal (HPA) stress axis.