Here are 10 common symptoms of hypothyroidism (an underactive thyroid). Not everyone has all of these, and symptoms can develop slowly over time.
1. Fatigue
Feeling unusually tired or low on energy, even after enough sleep.
2. Weight Gain
Unexplained weight gain or difficulty losing weight despite normal eating habits.
3. Cold Sensitivity
Feeling cold more easily than others or needing extra layers.
4. Dry Skin
Skin may become rough, flaky, pale, or itchy.
5. Hair Changes
Hair can become dry, brittle, thin, or fall out more than usual (including eyebrows).
6. Constipation
Slower digestion leading to less frequent or difficult bowel movements.
7. Slow Heart Rate
A lower-than-normal resting heart rate.
8. Depression or Low Mood
Feeling down, less motivated, or mentally “sluggish.”
9. Memory or Concentration Problems
Trouble focusing, forgetfulness, or “brain fog.”
10. Menstrual or Growth Changes
- Irregular or heavy periods
- Delayed puberty or slowed growth (especially important in teens)
Important Note
These symptoms can overlap with other conditions or normal life changes (like stress or growth). Only a blood test can confirm hypothyroidism.
If you or someone your age is experiencing several of these symptoms, it’s a good idea to talk with a parent/guardian and a healthcare provider for proper evaluation and guidance.
If you’d like, I can also:
- Explain what causes hypothyroidism
- Break down how it’s diagnosed
- Discuss treatment options in a teen-friendly way