Symptoms That Could Indicate Hyperthyroidism

Lisette Marie

19. Difficulty Concentrating (a.k.a. “Thyroid Fog”)

Frustrated tired afro american man office worker with closed eyes trying to concentrate at workplace. Photo Credit: Envato @StudioVK

Brain fog isn’t exclusive to hypothyroidism. Hyperthyroidism can also interfere with cognitive clarity, making it hard to focus, remember details, or complete tasks. Some describe it as “mental hyperactivity” where thoughts are racing, but memory and decision-making suffer. This can be especially frustrating for high-performing individuals who suddenly feel scattered, forgetful, or overwhelmed by routine tasks.

20. Increased Anxiety or Panic Attacks

Business woman, anxiety and stress at computer in office at night working late on deadline. Tired A. Photo Credit: Envato @YuriArcursPeopleimages

While anxiety can have many root causes, hyperthyroidism is a physiological trigger that’s often overlooked. Excess thyroid hormone overstimulates the nervous system, leading to restlessness, jitteriness, and even full-blown panic attacks—sometimes with no obvious emotional cause. If you’re experiencing heart palpitations, a sense of dread, or difficulty relaxing despite no clear trigger, it’s worth checking your thyroid levels.

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19. Difficulty Concentrating (a.k.a. “Thyroid Fog”)

20. Increased Anxiety or Panic Attacks

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