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.
This increases your stress level, which can lead to anxiety, depression, and psychosomatic difficulties (headaches, ulcers, hypertension, and so on). On the other hand, handling situations in an aggressive manner also works in the short run because you may achieve a temporary emotional release and get your needs met through intimidation.