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.
Paranoia or panic disorders can strike women as they experience the hormonal changes that occur alongside the aging process. Women may find themselves trapped in a state of high anxiety, finding themselves plagued with worry, fraught with panic, and unexplainably suspicious of others. As a result, paranoia during menopause can cause relationship problems, career interruptions and frazzled nerves as women attempt to deal with a pervasive sense of dread.