Overview
Thyroid cancer begins when cells in the thyroid gland grow out of control. There are several types, including papillary, follicular, medullary, and anaplastic thyroid cancer. Some types are more common and often grow slowly, while others are more aggressive. Early evaluation can help guide treatment and follow-up.
Key Symptoms
A thyroid cancer may appear as a lump or swelling in the front of the neck. Other symptoms can include hoarseness, trouble swallowing, trouble breathing, or pain in the neck or throat. Some people notice swollen lymph nodes in the neck. In many cases, especially early on, there may be no symptoms.
Causes and Risk Factors
The exact cause is not always known, but thyroid cancer develops from changes in thyroid cells. Risk factors can include past exposure to radiation, especially to the head or neck, certain inherited genetic conditions, and a family history of thyroid cancer. Some thyroid conditions may increase the chance of finding thyroid nodules, but not every nodule is cancer. Risk can vary by the specific type of thyroid cancer.
Who Is Affected
Thyroid cancer can affect adults of many ages and can also occur in children, though this is less common. It is more often diagnosed in women than in men. People with a family history of medullary thyroid cancer or certain inherited syndromes may have a higher risk. People exposed to radiation earlier in life may also be at increased risk.
Prevention
There is no guaranteed way to prevent thyroid cancer. Limiting unnecessary exposure to radiation, when possible, may reduce risk. People with a strong family history or known inherited syndromes may benefit from genetic counseling and medical follow-up. Regular checkups can help evaluate thyroid nodules or symptoms that need testing.
Diagnosis and Tests
A healthcare professional may examine the neck and ask about symptoms, family history, and radiation exposure. Common tests include thyroid ultrasound and fine-needle aspiration biopsy to study cells from a thyroid nodule. Blood tests may help assess thyroid function, but they do not by themselves confirm most thyroid cancers. Imaging and other tests may be used to understand the type and stage.
Treatment Categories
Treatment depends on the type of thyroid cancer, its size, whether it has spread, and the person's overall health. Common treatment categories include surgery, radioactive iodine for some types, thyroid hormone therapy, targeted therapy, radiation therapy, and sometimes chemotherapy. Some small, low-risk thyroid cancers may be monitored closely instead of treated right away. Treatment planning is individualized and should be discussed with a cancer specialist.
Living With It
Living with thyroid cancer may involve surgery recovery, ongoing blood tests, imaging, and long-term follow-up. Some people need lifelong thyroid hormone replacement after treatment. Emotional stress, fear of recurrence, and practical concerns about work or family are also common. Support from healthcare teams, counselors, and patient support groups can help.
When to Seek Medical Care
Seek medical care if you notice a new lump in the neck, persistent hoarseness, trouble swallowing, or swelling that does not go away. Also seek care for unexplained neck pain or enlarged lymph nodes. If you have a family history of thyroid cancer or a history of radiation exposure, mention this during evaluation. Prompt assessment helps determine whether testing is needed.
When It May Be an Emergency
Get urgent medical help if you have severe trouble breathing, rapidly worsening swelling in the neck, or sudden inability to swallow. These symptoms can have several causes, including serious blockage or pressure in the neck, and need immediate assessment.