Hashimoto's thyroiditis
Autoimmune hypothyroidism
Autoimmune conditionThe most common cause of an underactive thyroid in the US. The immune system slowly damages the thyroid, so it makes less hormone over time.
For education only — this guide can't diagnose you. If these signs sound familiar, talk with a healthcare provider. Book a consult
What happens
Immune cells and antibodies (TPO and thyroglobulin antibodies) gradually inflame the thyroid. Many people have positive antibodies for years while their thyroid levels are still normal. Over time the gland may not keep up, leading to hypothyroidism.
Who gets it
Hashimoto's is many times more common in women. It often appears between 30 and 50, and around pregnancy and perimenopause. A family history of thyroid or other autoimmune disease raises the risk.
Signs worth getting checked
- Fatigue and sluggishness
- Feeling cold
- Weight gain or difficulty losing weight
- Constipation
- Dry skin, thinning hair, or brittle nails
- Heavier or irregular periods
- Low mood or brain fog
- A feeling of fullness in the neck, or an enlarged thyroid (goiter)
Labs to ask about
- TSH
- Free T4, and sometimes free T3
- TPO antibodies
- Thyroglobulin antibodies
- Thyroid ultrasound if the gland is enlarged or a lump is felt
Treatments your doctor may discuss
- Thyroid hormone replacement (usually levothyroxine) when levels are low, adjusted with blood tests
- Regular monitoring if antibodies are positive but hormone levels are normal
- Closer monitoring before and during pregnancy
Supportive steps to discuss with your provider
- Ask about selenium. Some studies show it lowers TPO antibodies, but too much is harmful, so the dose should be guided.
- Ask to be screened for celiac disease, which is more common with Hashimoto's.
- Check ferritin, vitamin D, and B12, which often run low.
- Ask your provider how to time thyroid medicine. It's usually taken at the same time each day, apart from iron, calcium, and coffee.
- Avoid high-dose iodine or kelp unless your provider recommends it.
See a doctor promptly if you have
- You're pregnant or planning pregnancy and have thyroid disease or thyroid antibodies
- A new lump, rapid neck swelling, or trouble swallowing or breathing
- Extreme fatigue with a slow heart rate or confusion
- Symptoms that continue despite treatment
Related conditions
Ready to find the root cause?
Dr. Lesher is a Naturopathic Doctor who focuses on autoimmune and chronic conditions in women. Since 2020, she's helped hundreds of patients stop managing symptoms and start healing.