Thyroid Cancer Types and How It Spreads to Lymph Nodes

Thyroid cancer can sound scary, but understanding how it spreads and what it means for your health is the first step in taking control. One of the most common places thyroid cancer spreads is to the lymph nodes in the neck, also called cervical lymph nodes.

What is Thyroid Cancer?

Thyroid cancer starts in the thyroid gland, which is the butterfly shaped gland at the base of your neck that helps regulate your metabolism. The thyroid produces hormones that regulate metabolism, heart rate, blood pressure, and body temperature. When cells in the thyroid undergo abnormal changes and multiply uncontrollably, it can lead to thyroid cancer. The two main types that often spread to neck lymph nodes are:

Papillary thyroid carcinoma (PTC) This is the most common type.

Medullary thyroid carcinoma (MTC) This is the less common but can also spread to lymph nodes.

Where Does It Spread First?

Most thyroid cancers spread first to the cervical lymph nodes. These are small, bean shaped structures in your neck that help filter fluids and fight infection.

How Does Thyroid Cancer Spread to Lymph Nodes?

Step 1: You Notice Something Different

You may feel a small lump or swelling in the lower front of your neck while washing your face, shaving, or checking your skin. You might also notice hoarseness, trouble swallowing, or a persistent cough.

Step 2: Tumor Forms in the Thyroid

Cancer cells start growing in the thyroid gland.

Step 3: Cancer Cells Break Away

Some cancer cells separate from the main tumor and slip into nearby lymphatic vessels which are a network of tiny tubes that carry fluid and immune cells.

Step 4: They Travel Through Lymphatic Vessels

These cancer cells travel like hitchhikers through lymphatic fluid toward the nearest lymph nodes in the neck (cervical nodes).

Step 5: Settle in Cervical Lymph Nodes

Cancer cells settle in one or more lymph nodes, where they may grow into small lumps that you or your doctor might feel.

Step 6: You or Your Doctor Notices Swelling

You or your doctor might feel swollen lymph nodes in your neck. They might look or feel like small, firm lumps that aren’t usually painful.

Step 7: Doctor Confirms Diagnosis

Your doctor will order tests like ultrasound, fine-needle biopsy, or CT scans to check if the lymph nodes are cancerous.

Step 8: Treatment Planning

If cancer is confirmed, your doctor will discuss surgery, radioactive iodine therapy, or other treatments depending on the type of thyroid cancer.

Why Does This Matter?

Papillary thyroid cancer (PTC) is especially known for spreading to the neck lymph nodes, but this doesn’t always mean a worse outcome. Many people with PTC that has spread to lymph nodes still do very well with treatment.

Medullary thyroid cancer (MTC) also likes to spread to the neck, but treatment is different because it doesn’t respond to radioactive iodine.

Something To Think About:

If you notice any lumps in your neck or other symptoms, tell your doctor. Cancer can spread to the cervical lymph nodes through the lymphatic system. Doctor will request imaging tests, biopsy, and a treatment plan will help determine the best course of action.

Sources:

American Cancer Society. (2023). Thyroid Cancer. https://www.cancer.org/cancer/types/thyroid-cancer.html

Mayo Clinic. (2023). Thyroid Cancer. https://www.mayoclinic.org/diseases-conditions/thyroid-cancer/symptoms-causes/syc-20354161

National Cancer Institute. (2023). Thyroid Cancer Treatment (Adult) (PDQ®)–Patient Version. https://www.cancer.gov/types/thyroid/patient/thyroid-treatment-pdq