Thyroid dysfunction (whether hypothyroidism – underactive thyroid, or hyperthyroidism – overactive thyroid) can show up in many different ways because the thyroid helps regulate metabolism, energy, and hormones. Here are 10 common symptoms to look out for:

Hypothyroidism (Underactive Thyroid)

Fatigue or low energy

Weight gain (despite no major changes in diet or exercise)

Dry skin and brittle hair

Cold intolerance (feeling unusually cold)

Constipation

Hyperthyroidism (Overactive Thyroid)

Unexplained weight loss (even with normal or increased appetite)

Rapid or irregular heartbeat (palpitations)

Nervousness, anxiety, or irritability

Heat intolerance and excessive sweating

Tremors (shaky hands or fingers)

⚠️ Some people may also experience neck swelling (goiter), changes in voice, or menstrual irregularities with either condition.