Thyroid problems happen when the thyroid gland produces either too much or too little hormone. This small gland in the neck affects metabolism, energy, weight, and mood. The two main types of thyroid disorders are hypothyroidism (underactive thyroid) and hyperthyroidism (overactive thyroid).

Signs of hypothyroidism (underactive thyroid)
Fatigue
Weight gain
Feeling cold often
Dry skin
Constipation
Depression or mood swings
Slow heart rate
Hoarseness
Thinning hair
Poor memory or concentration
Menstrual irregularities
Puffy face
Enlarged thyroid (goiter)

Signs of hyperthyroidism (overactive thyroid)
Unexplained weight loss
Rapid heartbeat or palpitations
Feeling anxious or irritable
Tremors in hands
Feeling hot or sweating a lot
More frequent bowel movements
Weakness or tired muscles
Difficulty sleeping
Irregular menstrual cycles
Bulging eyes (in some cases)
Enlarged thyroid (goiter)

When to see a doctor
If you notice sudden weight changes, energy issues, mood disturbances, or changes in heart rate, speak to a healthcare provider. These may indicate a thyroid imbalance.

Diagnosis
Blood tests (TSH, T3, T4)
Thyroid ultrasound
Radioactive iodine scan (in some cases)