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.
You might be irritable or easily scared. You might even feel depressed because of your constant state of worry and stress. Eventually, chronic anxiety can cause long-term symptoms including muscle aches, sweating, fatigue, upset stomach, shaking, and insomnia. During a panic attack, you may have trouble breathing, and you may experience symptoms of dizziness, blurred vision, and rapid heartbeat.