Doctors don’t fully understand why your immune system misfires this way. It could be set off by a faulty gene, a virus, or something else. Or it could be a combination of causes.
You may be more likely to get autoimmune thyroiditis if you:
- Are a woman
- Are middle-aged
- Have another autoimmune disorder like lupus, type 1 diabetes, or rheumatoid arthritis
- Are related to someone who has autoimmune thyroiditis
- Have been exposed to environmental radiation