A hard, painless mass in the front of the neck is the first detectable symptom in many people with thyroid cancer; it may increase in size over time.
Hoarseness or other voice changes lasting more than two weeks may also be caused by thyroid cancer.
Swallowing difficulty or a feeling of choking may be an early sign of thyroid cancer.
This is usually as a result of the spread of cancer to the lymph nodes in the neck and hence one needs medical attention.
Cough that takes quite a long time and it is not associated with common cold or respiratory infection.