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    10 Signs to Check for Abnormal Thyroid Function

    2 minute(s) read
    Information by
    Bangkok Hospital Headquarter
    Updated on: 09 Jan 2026
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    10 Signs to Check for Abnormal Thyroid Function
    AI Translate
    Translated by AI
    Bangkok Hospital Headquarter
    Updated on: 09 Jan 2026

    1) Fatigue, Easy tiredness, Palpitations

    Patients with hyperthyroidism can impact heart function, causing easy tiredness, palpitations, or fatigue, especially in cases of low thyroid activity.

    2) Hair Loss

    Hair loss can occur with either hyperthyroidism or hypothyroidism.

    3) Insomnia

    Increased frequency of insomnia, even in people who usually fall asleep easily and have a sound sleep. This can happen because abnormal thyroid may secrete too much hormone, stimulating the central nervous system and disrupting rest.

    4) Constantly Feeling Drowsy

    This can occur in a hypothyroid condition, leading to tiredness and lack of vitality.

    5) Abnormal Weight Gain or Loss

    An abnormal thyroid that secretes too much hormone can accelerate metabolism in hyperthyroidism, leading to rapid weight loss. In contrast, hypothyroidism can make it easier to gain weight due to slower metabolism.

    6) Frequent Hunger or Lack of Appetite

    If the thyroid is overactive, it may lead to frequent hunger, increased eating, but still losing weight. If the thyroid is underactive, it may lead to less appetite, bloating, and easy weight gain.

    7) Abnormal Bowel Movements

    Less frequent bathroom visits or constipation, even when consuming fruits and vegetables. This can happen in a body with thyroid hormone deficiency. In hyperthyroidism, there’s an increase in bowel movement leading to more frequent stools, whereas hypothyroidism may be associated with constipation.

    8) Constantly Feeling Cold or Overheating

    If the thyroid does not secrete enough hormone, the metabolic rate slows down, reducing body heat. Hyperthyroidism can cause overheating and excessive sweating, while hypothyroidism can lead to constantly feeling cold.

    9) Dry Skin

    Low thyroid function can slow metabolism, affecting skin hydration and leading to dryer skin or reduced sweating.

    10) Palpitations

    An excessive amount of thyroid hormone can accelerate the body’s overall processes, causing a rapid heartbeat.


    ***Don’t worry too much about these thyroid warning signs, as some symptoms can also arise from other causes. It’s best to undergo a comprehensive health check.

    For more information, please contact

    Bangkok Diabetes, Thyroid and Endocrine Center

    2 nd Floor Bangkok Hospital Building

    Monday-Friday: 7.00 - 16.00

    Saturday-Sunday: 7.00 – 16.00

    (+66) 2755 1129

    (+66) 2755 1130

    (+66) 2755 1697

    1719 (local mobile calls only)

    [email protected]

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