Thyroid Diseases and Surgery: Symptoms, Diagnosis, and Treatment

The thyroid gland is a vital, butterfly-shaped organ located at the front of your neck that dictates your body's metabolic rate. Thyroid diseases occur when this gland is underactive, overactive, forms nodules, or becomes cancerous. The treatment journey spans a wide spectrum, from simple medication management to advanced surgical interventions, depending on the specific condition.

• Through the hormones it secretes, the thyroid gland manages your entire metabolism, from your heart rate to your body temperature.
• The most common issues encountered are thyroid nodules and hormonal dysfunctions.
• The vast majority of nodules are benign; only about five percent carry a risk of cancer.
• Treatments include medications, radioactive iodine therapy, or surgical methods.
• Thyroid surgeries are performed safely with modern technologies like nerve monitoring, which minimizes the risk of vocal cord damage.

What Are Thyroid Gland Diseases?

Located just in front of the windpipe, the thyroid is a small but incredibly hard-working endocrine organ weighing about twenty to twenty-five grams. It is controlled by TSH (Thyroid Stimulating Hormone), which is released by the pituitary gland in our brain. Using the iodine from the food we eat, the thyroid produces hormones called T3 and T4. These hormones enter the bloodstream and determine the working pace of almost every cell—from your musculoskeletal and digestive systems to your heart rhythm and brain function.

Thyroid diseases are characterized by the imbalanced production of these hormones or physical changes in the gland itself, such as enlargement or nodule formation. In regions where dietary iodine deficiency has historically been common, such as certain parts of Türkiye, thyroid conditions are frequently seen. Although the widespread use of iodized salt has reduced the incidence of goiter, autoimmune thyroid diseases and thyroid nodules remain highly prevalent in the community.

Causes and Risk Factors

A combination of genetic predisposition, environmental factors, and immune system issues plays a role in the onset of thyroid diseases. If you have a family history of thyroid conditions or thyroid cancer, your risk of developing these diseases is significantly higher. Women are about five to eight times more likely to be affected than men; periods of major hormonal shifts, such as pregnancy and menopause, can act as specific triggers.

Your dietary habits also directly impact your thyroid health. While insufficient iodine intake can lead to an enlarged thyroid (goiter), excessive iodine consumption can flare up autoimmune diseases. Having a history of radiotherapy (radiation treatment) to the head and neck area, or significant radiation exposure, is a major risk factor for developing thyroid nodules and cancer. Furthermore, stress, smoking, and certain viral infections are known to confuse the immune system, causing it to attack the thyroid gland.

Symptoms and Types of Thyroid Diseases

The symptoms of thyroid diseases vary greatly depending on whether the issue is a hormone deficiency, an excess, or a physical mass. Sometimes these conditions cause no symptoms at all and are discovered by chance during routine check-ups. Other times, they present with complaints that severely reduce your quality of life. These diseases are generally examined under four main categories.

Hypothyroidism (Underactive Thyroid)

Hypothyroidism occurs when the thyroid gland cannot produce enough hormones to meet the body's needs. Because your metabolism slows down, your bodily functions essentially go into idle mode. The most common complaints among patients include constant fatigue, sluggishness, extreme sensitivity to cold (always feeling chilly), and gaining weight or being unable to lose weight despite dieting. Dry skin, hair loss, constipation, a deepened voice, a slowed heart rate, menstrual irregularities, and a depressed mood are other common signs. In older adults, it can manifest as forgetfulness and poor concentration.

Hyperthyroidism (Overactive Thyroid)

Hyperthyroidism is when the thyroid gland produces more hormones than necessary, sending your metabolism into overdrive. The body is in a state of constant exertion. Patients often experience rapid weight loss despite having a hearty appetite and eating well. Palpitations, trembling hands, excessive sweating, intolerance to heat, irritability, sleep disturbances, and frequent bowel movements are the most prominent complaints. Patients generally feel constantly tense and restless. If left untreated, it can lead to heart rhythm disorders and osteoporosis (bone thinning).

Hashimoto's Disease

Hashimoto's thyroiditis is an autoimmune disease that occurs when the immune system mistakenly identifies the thyroid gland as foreign tissue and attacks it. Over time, this attack destroys the thyroid cells, rendering the gland unable to produce hormones. It is the most common cause of hypothyroidism in the general population. Although a temporary hyperthyroid phase (thyrotoxicosis) may be seen in the early stages of the disease, the permanent outcome is usually an underactive thyroid. It is diagnosed by high levels of Anti-TPO and Anti-TG antibodies in the blood.

Graves' Disease

Like Hashimoto's, Graves' disease is an autoimmune condition. However, instead of destroying the thyroid gland, the immune system constantly stimulates it to produce hormones. More commonly seen in young and middle-aged women, this condition is the most frequent cause of hyperthyroidism. The most typical and distinguishing symptom of Graves' disease is exophthalmos (eye involvement), which causes the eyes to appear as if they are bulging out of their sockets. Redness, dryness, double vision, and light sensitivity in the eyes may also occur.

Diagnosis: How Is It Diagnosed at the Hospital?

The first step in diagnosing thyroid diseases is a detailed neck examination by a specialist physician. Your doctor will manually check the size and texture of your thyroid gland and feel for any nodules. Next, to evaluate thyroid function, blood tests are ordered to check TSH, Free T3, and Free T4 hormone levels. When necessary, autoimmune antibody tests are also requested.

To examine the physical structure, the most fundamental and reliable imaging method is a thyroid ultrasound. An ultrasound allows for a detailed assessment of the nodules' size, structure (whether they are cystic or solid), irregular borders, and any internal calcifications (microcalcifications). For nodules that look suspicious on the ultrasound, a Fine Needle Aspiration Biopsy (FNAB) is performed to make a definitive diagnosis. This procedure is as simple as a routine blood draw; guided by ultrasound, a very thin needle is inserted into the nodule to collect a cell sample, which is then examined in the pathology laboratory.

Treatment and Thyroid Surgery

The treatment of thyroid diseases is tailored to the root cause of the problem. For patients with hypothyroidism who lack hormones, daily thyroid hormone pills are prescribed to replace the deficit. In cases of hyperthyroidism, medications that suppress the overactive thyroid gland or radioactive iodine therapy are used. However, if the nodules are very large, pressing on surrounding tissues, or if there is a suspicion of cancer, thyroid surgery comes into play.

Pre-Surgery Preparation

Once a surgical decision is made, a series of tests are conducted to prepare the patient as safely as possible. Blood tests, an electrocardiogram (ECG), and an anesthesiologist consultation are standard procedures. Additionally, before the surgery, an Ear, Nose, and Throat (ENT) specialist will check the movement of your vocal cords. Patients taking blood thinners must stop or adjust these medications a certain period before the operation, under their doctor's supervision. For hyperthyroidism patients, the goal is to normalize hormone levels with medication prior to surgery.

Surgical Techniques Applied

The main goal in thyroid nodule surgery and cancer surgery is to remove the diseased tissue from the body without damaging surrounding vital structures. Depending on the extent of the disease, a lobectomy (where only one half of the thyroid gland is removed) or a total thyroidectomy (where the entire gland is removed) is performed. In cancer cases, the entire thyroid gland and, if necessary, the lymph nodes in the neck are cleared out.

During the surgery, the two structures that require the most careful attention are the nerves leading to the vocal cords and the parathyroid glands, which maintain calcium balance. In modern surgery, nerve monitoring devices are used to minimize the risk of hoarseness. Thanks to this technology, the location and function of the nerves are tracked in real-time throughout the operation, reducing the risk of permanent vocal cord damage to less than one percent.

Post-Surgery Recovery Process

Following thyroid surgery, patients are generally kept under observation in the hospital for one or two nights. A minimal incision scar remains on the neck, which over time blends in with the natural skin lines and becomes barely noticeable. Post-operative pain can be easily managed with simple painkillers. Patients who have had their entire thyroid gland removed will need to take a single daily dose of thyroid medication for the rest of their lives to meet their body's hormone needs.

As part of thyroid cancer treatment, radioactive iodine therapy may be necessary depending on the post-surgery pathology results. This treatment is not like chemotherapy; it does not cause hair loss or severe nausea. The radioactive iodine, given to the patient in capsule or liquid form, specifically targets and destroys only any remaining thyroid cells. The patient needs to be isolated in a special lead-lined room for a few days while emitting radiation, after which they can return entirely to their normal life. Just like breast cancer, the success rate for thyroid cancers is very high when diagnosed early; you can also learn about the importance of early diagnosis in cancer treatments from our article titled What Are the Symptoms of Breast Cancer and How Is It Treated?.

Complications and Risk Groups

When left untreated, thyroid diseases lead to serious health problems. Advanced hypothyroidism can lead to a life-threatening condition called myxedema coma, while uncontrolled hyperthyroidism can cause a thyroid storm (extremely high fever, heart failure, confusion). These risks are particularly pronounced in elderly individuals and those with existing heart conditions. During pregnancy, an imbalance in thyroid hormones carries significant risks for the baby's brain development and the overall course of the pregnancy.

Surgical complications, on the other hand, are quite low in experienced hands. The most common temporary issue is a drop in calcium levels, which happens if the parathyroid glands are affected during surgery. This condition manifests as numbness and tingling in the hands and around the lips, and it resolves quickly with calcium supplements. The risk of bleeding and infection exists in thyroid surgeries just as in any surgical procedure, but this possibility is minimized through meticulous bleeding control.

When to See a Doctor?

To protect your thyroid health, you need to read your body's signals correctly. If you notice a visible swelling at the front of your neck, feel a hard lump, have difficulty swallowing, struggle to breathe, or experience unexplained hoarseness in your voice, you should consult a specialist without delay. Similarly, if you are experiencing sudden weight changes despite your diet, chronic fatigue, unexplained palpitations, or extreme irritability, your thyroid hormones need to be checked.

Certain situations require emergency medical intervention. In cases of sudden shortness of breath caused by a rapidly growing nodule blocking the windpipe, severe palpitations, high fever, and confusion (suspected thyroid storm), you should immediately go to the nearest emergency room or call 112.

The Process at BHT CLINIC

At BHT CLINIC İstanbul Tema Hastanesi, the diagnosis and treatment of thyroid diseases are carried out through a multidisciplinary approach involving the Endocrinology, General Surgery, Radiology, and Pathology departments. Thanks to advanced ultrasonography equipment and modern surgical tools like nerve monitoring, our patients have access to the safest treatment options. In emergencies such as unexpected respiratory distress or thyroid crises, our Emergency Medicine department provides uninterrupted service 24/7 with an expert team. Your treatment plan is organized on a personalized basis to maintain your quality of life at the highest level.

Frequently Asked Questions

How many hours does thyroid surgery take?

The duration of thyroid surgery varies depending on the extent of the disease and the technique used, but it is generally completed between 1.5 to 3 hours. This time may be longer in cases where cancer has spread to the lymph nodes and an extensive clearing called a neck dissection is required.

When is a thyroid nodule dangerous?

Thyroid nodules can be dangerous if they grow rapidly, feel very hard and immobile to the touch, or cause hoarseness or difficulty swallowing. Additionally, irregular borders and the presence of microcalcifications (calcification) on an ultrasound increase the suspicion of cancer.

How is thyroid surgery performed?

Thyroid surgery is performed under general anesthesia through a horizontal incision of about 3-5 centimeters made at the lower part of the neck. The surgeon safely removes the diseased thyroid tissue from the body while protecting the nerves leading to the vocal cords and the parathyroid glands.

Will my voice become hoarse after thyroid nodule surgery?

It is normal to experience slight voice changes or vocal fatigue in the first few days due to swelling in the surgical area. However, thanks to the use of nerve monitoring technology, the risk of permanent damage to the nerves stimulating the vocal cords and permanent hoarseness is extremely low.

Does thyroid cancer treatment provide a definitive cure?

Yes, thyroid cancers (especially the most common papillary type) are among the cancer types in the human body that respond best to treatment. With the correct surgical intervention and, when necessary, radioactive iodine therapy, it is possible for the vast majority of patients to be completely cured of the disease.

You can book an appointment for a healthy life and an accurate diagnosis.

This article is for informational purposes only; please be sure to consult your physician for diagnosis and treatment.