Thyroid Disorders

The thyroid gland is an organ located in the front of the neck. It produces thyroid hormone which is important for the regulation of metabolism in adults. In children, it is important for physical growth and mental development.

Thyroid Problems may present as a neck swelling or lump in the front of the neck. These lumps are usually located near the midline at the lower part of the neck. You may notice that the swelling moves up and down during swallowing. If the thyroid is very large, you may also experience difficulty swallowing, tightness in the neck and throat, or difficulty breathing especially when lying down.

In some cases, the thyroid hormone levels may be affected. If the levels are too high, you may experience symptoms such as increased sweating, increased appetite, weight loss, insomnia, palpitations, and diarrhoea. If the thyroid hormone levels are low, you may experience lethargy, reduced appetite, weight gain, and constipation.

Not all thyroid lumps are cancerous. In fact, 90 to 95% of thyroid lumps are benign. Some thyroid cancers may present suspicious symptoms. These include a rapidly enlarging thyroid mass, change in the voice, difficulties in swallowing, noisy breathing, and shortness of breath. If the cancer has spread to the surrounding lymph nodes, it may lead to lumps at either side of the neck.

However, many patients with thyroid cancer simply present as an isolated thyroid lump. There are also patients who have thyroid cancer that is incidentally found when performing general health screening.

Thyroid lumps are much less common in children. However, up to 25% of thyroid lumps in children are cancerous. Fortunately, with the appropriate treatment, the prognosis for children with thyroid cancer is generally better than that of adults.

Any adult or child with a lump in the neck should consult an Otolaryngology - Ear Nose and Throat (ENT) doctor.

Your doctor will first ask you some questions about your medical history and proceed to examine your neck to evaluate the thyroid gland. A few important tests may then be performed.

This is an endoscopic evaluation of the upper airway. It is critical in the evaluation of thyroid nodules as thyroid cancers can invade the nerve that controls the voice box, causing reduced movement of the vocal cord. It is a quick and relatively painless procedure that can only be performed by trained doctors at the ENT clinic.

This is a non-invasive method of evaluating the thyroid gland. Many of our doctors are trained to perform this procedure by the bedside.

A biopsy may be required to evaluate thyroid nodules. A small needle, similar to that used in blood taking, is used to extract some cells. This helps us to evaluate the likelihood that a thyroid lump is cancerous. FNAC is sometimes performed with the help of an ultrasound to guide the needle.

A blood test can be used to determine whether your thyroid hormone levels are too high or too low.

Risk factors for thyroid cancer include previous radiation exposure as well as family history of thyroid cancer. Males with thyroid nodules are also more likely to have thyroid cancer than females.

Benign thyroid lumps that are small and asymptomatic can be left alone. However, as they enlarge (beyond about 4cm), they may cause discomfort, swallowing problems, or breathing difficulties. Surgery can then be performed to remove the part of the thyroid gland that contains these lumps.

Sometimes, fine needle aspiration may show some cells that are not typical of benign nodules. Your doctor may then recommend surgery to remove the entire nodule so that it can be examined to ensure that there are no cancer cells within.

Cancerous thyroid lumps should be removed surgically. Depending on the size, location, and number of nodules, your doctor may recommend removing half of the thyroid gland or the entire thyroid gland. If lymph nodes are involved, a procedure called a neck dissection may be required to remove these lymph nodes in a systematic manner. The most significant risk of thyroid surgery is injury to the recurrent laryngeal nerve. This nerve controls the movement of the vocal cord which may affect both the voice and breathing. If the entire thyroid gland needs to be removed, calcium levels may also drop after the operation and require replacement.

Post-operatively, radioactive iodine (RAI) may need to be administered. This is a form of targeted radiotherapy which helps to remove any remnant thyroid cells in the body. It is a non-invasive treatment that is administered orally.

After treatment is completed, you will have regular follow-up sessions with a head and neck cancer specialist. The specialist will perform regular examinations, blood tests, and ultrasounds to ensure that the disease is well controlled.