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.
People with anxiety and high amounts of stress have been observed to have higher than normal rates of ulcers and more frequent infections caused by H. pylori. (4) Stress weakens the immune system and worsens digestion, making it more likely you become sick from various bacteria or microbes you come into contact with.