My sister was diagnosed with thyroid cancer. Am I at a high risk too?

Slightly higher risk. So if you have a first degree relative with thyroid cancer, you do have a slightly higher risk than the general population. In general it is recommended to have a thyroid ultrasound done to check for nodules. If any nodule is over 1 cm or has calcifications, it should be biopsied.
Possibly. If other family members have been diagnosed with thyroid, endocrine, breast, uterine, or colon cancers, you could be at higher risk. Also, a special type of thyroid cancer - medullary cancer - often runs in families. Otherwise only 5-10% of thyroid cancers are thought to be hereditary. A consultation with a genetic counselor can help you assess your inherited cancer risk.

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