Symptoms That Could Indicate Hyperthyroidism

Lisette Marie

23. Neck Fullness or Pressure

Woman with sore throat holding her neck at home. Photo Credit: Envato @Wavebreakmedia

Even if you don’t see a goiter, hyperthyroidism can cause a sense of tightness or fullness in the neck. This might feel like difficulty swallowing, a lump in the throat, or a persistent urge to adjust your collar. In some cases, this discomfort is caused by subtle thyroid swelling or nodules that aren’t yet visible but are exerting pressure on surrounding tissues. If you experience unexplained tightness or discomfort in the neck, ask your doctor about a thyroid ultrasound.

24. Heightened Startle Reflex

Startled female in black, hands on cheeks, mouth open. Reflects the intensity of reacting to life's. Photo Credit: Envato @yavdat

Do everyday sounds suddenly make you jump? Hyperthyroidism can prime your nervous system into a constant state of hyper-alertness. The result: an exaggerated startle reflex. You may flinch at unexpected noises or feel overly reactive to your surroundings—almost as if you're always “on edge.” This isn’t just anxiety—it’s your overactive thyroid flooding your system with stimulating hormones. If your reactions feel outsized, or you’re frequently on high alert without clear cause, it could be a physiological response, not just a mental one. It’s one of those odd, easy-to-overlook signs that often gets misread as simple stress.

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23. Neck Fullness or Pressure

24. Heightened Startle Reflex

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