Thyroid nodules are small growths or lesions that develop in the thyroid gland, located at the front of the neck. They may be single or multiple, solid or fluid-filled and, in the vast majority of cases, they are benign.

They are a common finding, and many people may have a thyroid nodule without knowing it. Most do not cause pain or interfere with everyday life, so they are often discovered incidentally during a medical examination or an ultrasound scan performed for another reason.

Although they generally do not cause symptoms, certain changes may provide relevant information about their progression. Difficulty swallowing, a persistent sensation of pressure in the neck or ongoing changes in the voice are some of the signs that should prompt consultation with a specialist, particularly when they are new or progressively worsen over time.

"The appearance of a symptom does not necessarily mean that the nodule is malignant or that there is a serious problem, but it may indicate that we should bring the check-up forward and assess whether there have been any changes in its size or in its relationship with the structures of the neck," explains Dr Juan Carlos Percovich, Head of the Department of Endocrinology and Nutrition at Hospital Ruber Internacional, part of the Quirónsalud Group.

Difficulty swallowing: when the nodule takes up more space

One of the symptoms that may develop when a thyroid nodule increases in size is difficulty swallowing, medically known as dysphagia.

The thyroid gland is located at the front of the neck, very close to structures involved in breathing, swallowing and voice production. When a nodule reaches a certain size or grows in a particular direction, it may exert pressure on neighbouring structures.

Some people describe this as a sensation that food is more difficult to swallow or that something becomes "stuck" in the throat when swallowing.

"We should not automatically assume that any difficulty swallowing is caused by the thyroid, as there are many other possible causes. However, in someone with a known thyroid nodule, a new or progressively worsening symptom should be assessed," says Dr Percovich.

The check-up can determine whether the symptom is related to the nodule and whether any changes have occurred since previous examinations.

A sensation of pressure in the neck that does not go away

Another symptom that may occur is a persistent sensation of pressure, fullness or a ‘lump’ in the throat.

Larger nodules may cause compressive symptoms due to their relationship with the trachea, oesophagus or other nearby tissues. In some patients, the sensation is mild, while in others it may become more noticeable when speaking, swallowing or taking a deep breath.

The specialist stresses that the aim is not to become alarmed by every neck symptom, but rather to pay attention to changes.

"When a patient who had previously been stable begins to notice pressure that was not there before, or feels that the sensation is becoming more pronounced, it is preferable to have it assessed rather than automatically waiting for the next scheduled check-up," says the Head of the Department of Endocrinology and Nutrition.

Why can a thyroid nodule cause changes in the voice?

The onset of persistent hoarseness, reduced vocal strength or changes in voice quality also deserves particular attention.

The close anatomical relationship between the thyroid gland and the nerves responsible for controlling the vocal cords means that certain changes in this area may affect the voice.

However, hoarseness is a very common symptom and can have numerous causes unrelated to the thyroid, ranging from a respiratory infection to reflux or vocal strain. What matters is paying attention when the change persists without a clear explanation, particularly in someone with a known thyroid nodule.

"A persistent change in the voice is a symptom that should not be dismissed. In most cases, there will be another explanation, but if the patient has a thyroid nodule, we need to investigate whether there is any relationship and rule out involvement of structures associated with voice production," explains Dr Juan Carlos Percovich.

Ultrasound is essential for determining whether the nodule has changed

When these symptoms occur, thyroid ultrasound is one of the main tools used to assess what is happening.

The examination makes it possible to study the characteristics of the nodule, measure it and compare it with previous scans, as well as assess its location and relationship with other structures in the neck.

However, imaging findings should always be interpreted within the patient’s overall clinical context. Size alone does not necessarily determine how a nodule will behave or whether it requires treatment.

"We do not treat an ultrasound image in isolation. We need to relate what we see on the scan to the patient’s symptoms, medical history and the way the nodule has evolved over time. It is this overall assessment that enables us to make more precise decisions," the specialist explains.

Depending on the findings, the endocrinologist may decide to continue monitoring, adjust the frequency of follow-up examinations or request additional tests.

Having a thyroid nodule does not mean that it needs to be treated

One of the messages Dr Percovich considers particularly important for patients is that detecting a thyroid nodule does not automatically mean that treatment is required.

Many remain stable for years and only require periodic monitoring. The decision to intervene depends on a number of factors, including ultrasound characteristics, progression, size, symptoms and the individual clinical assessment of each patient.

When a benign nodule causes compressive symptoms or significantly affects quality of life, minimally invasive techniques may be considered for selected patients in addition to conventional surgery.

"Our aim is to strike the right balance between avoiding unnecessary intervention and not delaying investigation when changes occur that warrant attention. Appropriate follow-up allows us to act precisely when it is genuinely necessary," says the specialist.

When should you bring your consultation forward?

In someone who has already been diagnosed with a thyroid nodule, the development of progressive difficulty swallowing, persistent pressure in the neck, ongoing changes in the voice, noticeable enlargement of an area of the neck or any new symptom should be discussed with a specialist.

This does not necessarily mean that a complication has developed. It means that it may be advisable to reassess the situation before the scheduled appointment and determine whether the nodule remains stable.

"We want patients to know what they should look out for, but without creating a sense of constant vigilance or unnecessary concern. Most thyroid nodules have a favourable course. The important thing is to ensure appropriate follow-up and seek medical advice when a new change appears," concludes Dr Juan Carlos Percovich.