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.
Ongoing, chronic stress, however, can cause or exacerbate many serious health problems, including: Mental health problems, such as depression, anxiety, and personality disorders. Cardiovascular disease, including heart disease, high blood pressure, abnormal heart rhythms, heart attacks, and stroke.