An underactive thyroid gland doesn't produce enough T4 or T3 hormones, or both. As a result, you could be experiencing the following symptoms:
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Fatigue
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Weight gain
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Depression
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Joint and muscle pain
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Sensitivity to cold
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Cold hands and feet
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Difficulty concentrating
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Mental fogginess
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Dry skin and hair
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Frequent, heavy periods
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Constipation
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Slow heart rate, commonly less than 60 beats per minute
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Swelling in the neck from an enlarged thyroid gland
Symptoms Related to an Overactive Thyroid Gland
An overactive thyroid gland produces higher than normal amounts of the T4 or T3 hormones, or both. As a result, you could be experiencing the following symptoms:
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Unexpected weight loss (which should always be assessed by a health professional), even when your appetite and the amount and type of food you eat remain the same or even increases
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Increased appetite
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Rapid heartbeat (more than 100 beats a minute), irregular heartbeat, or pounding of your heart
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Nervousness, anxiety, and irritability
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Tremors in hands or fingers
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Sweating
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Changes in menstrual patterns
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Increased sensitivity to heat
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More frequent bowel movements
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Swelling in the neck from an enlarged thyroid gland
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Fatigue and muscle weakness
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Difficulty sleeping
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Skin thinning
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Fine, brittle hair