What is Underactive Thyroid (Hypothyroidism)?
Underactive thyroid, or hypothyroidism, is a condition where the thyroid gland produces insufficient amounts of thyroid hormones. These hormones regulate the body’s metabolism, so low levels can slow down many bodily functions, leading to various symptoms.
What Causes Underactive Thyroid?
Common causes include:
- Autoimmune Disease – Hashimoto’s thyroiditis, where the immune system attacks the thyroid.
- Iodine Deficiency – Not getting enough iodine in the diet.
- Thyroid Surgery or Radiation – Removal or damage to the thyroid gland.
- Certain Medications – Some drugs can reduce thyroid function.
- Congenital Hypothyroidism – Present at birth.
- Pituitary Gland Disorders – Affecting thyroid hormone production indirectly.
Symptoms of Underactive Thyroid
Symptoms often develop slowly and may include:
- Fatigue and weakness
- Weight gain despite no change in diet
- Cold intolerance (feeling unusually cold)
- Constipation
- Dry skin and hair thinning
- Depression or low mood
- Slow heart rate
- Puffy face
- Hoarseness
- Muscle cramps or stiffness
- Memory problems or difficulty concentrating (“brain fog”)
- Menstrual irregularities or heavy periods
How is Underactive Thyroid Diagnosed?
Diagnosis involves:
- Blood Tests – Measuring thyroid hormone levels (TSH, free T4).
- Antibody Tests – To detect autoimmune thyroid disease.
- Physical Examination – Checking for thyroid enlargement or nodules.
- Imaging Tests – Ultrasound if structural issues are suspected.
How is Underactive Thyroid Treated?
The main treatment is:
- Thyroid Hormone Replacement Therapy – Daily use of synthetic levothyroxine to restore normal hormone levels.
- Regular Monitoring – Blood tests to adjust medication dosage and ensure proper thyroid function.
- Managing Symptoms – Addressing any related health issues as needed.
Prognosis of Underactive Thyroid
- With proper treatment, most people lead normal, healthy lives.
- Untreated hypothyroidism can lead to complications like heart disease, infertility, or myxedema (severe hypothyroidism).
- Lifelong medication is usually necessary.
Can Underactive Thyroid Be Prevented?
- Some causes like autoimmune thyroiditis cannot be prevented.
- Adequate iodine intake is important to prevent hypothyroidism due to iodine deficiency.
- Early diagnosis and treatment help avoid complications.
When Should You See a Doctor?
Consult a doctor if you notice:
- Persistent fatigue or weakness
- Unexplained weight gain
- Changes in mood or memory
- Feeling cold all the time
- Swelling in the neck
- Any symptoms listed above that worsen or interfere with daily life