Here’s a clear, medically-informed guide to 10 common symptoms of hypothyroidism (underactive thyroid) so you can recognize potential signs early.

🦋 What Is Hypothyroidism?

Hypothyroidism occurs when the thyroid gland doesn’t produce enough thyroid hormones, which regulate metabolism, energy, and many bodily functions.

🔹 10 Symptoms of Hypothyroidism

1. Fatigue and Weakness

Feeling unusually tired even after adequate sleep.
Muscle weakness or slower movements.

2. Weight Gain

Unexplained weight gain despite no major changes in diet or activity.
Often mild at first but gradually noticeable.

3. Cold Intolerance

Feeling cold while others are comfortable.
Hands and feet often feel cold due to slower metabolism.

4. Dry Skin and Hair

Skin may become rough, pale, or flaky.
Hair may thin, become brittle, and hair loss (including eyebrows) can occur.

5. Puffy Face or Swelling

Swelling around the eyes, face, or hands due to fluid retention (myxedema in severe cases).

6. Slow Heart Rate

Bradycardia (slower than normal heartbeat) can be a sign in moderate or severe hypothyroidism.

7. Constipation

Slower digestive function often leads to constipation.
Bloating and abdominal discomfort may also appear.

8. Mood Changes

Depression, low mood, irritability, or brain fog.
Memory or concentration difficulties can occur.

9. Hoarseness or Swelling in the Neck

Enlarged thyroid (goiter) may cause a visible neck swelling.
Voice may become hoarse due to swelling or slowed metabolism.

10. Brittle Nails and Puffy Extremities

Nails become weak and break easily.
Fingers, hands, or feet may feel swollen or stiff.

⚠️ Other Possible Signs

Swelling of eyelids
Slow reflexes
Puffy tongue
Carpal tunnel symptoms
Dry, coarse voice

🟢 When to See a Doctor

See a healthcare professional if you notice:

Persistent fatigue, unexplained weight gain, or swelling
Dry skin, hair loss, or brittle nails
Changes in mood or memory
Constipation or cold intolerance

Diagnosis: A simple blood test measuring TSH and free T4 confirms hypothyroidism.

💡 Tips for Managing Hypothyroidism

Take thyroid medication as prescribed if diagnosed.
Eat a balanced diet with adequate iodine, selenium, and zinc.
Regular exercise helps with energy, weight, and metabolism.
Avoid extreme calorie restriction, which can worsen symptoms.

I can also make a quick visual checklist of these 10 symptoms so you can easily track them for yourself or share with a family member.

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10 Symptoms of Hypothyroidism: Identify the Signs