Thyroid Disorders

The thyroid is a small, butterfly-shaped gland in the front of the neck that produces hormones controlling the body's metabolism, the way it uses energy. Thyroid disorders occur when the gland does not work as it should. It may produce too little hormone (underactive), too much (overactive), or develop swelling, nodules or other changes that affect how it functions.

Thyroid disorders are common and can affect people of any age, though they become more likely with age and are more frequent in women. An underactive thyroid is among the most common hormonal conditions. Some thyroid problems run in families or are linked to autoimmune conditions, and in some regions a lack of dietary iodine contributes to thyroid disease.

Symptoms depend on whether the thyroid is underactive or overactive. An underactive thyroid can cause tiredness, weight gain, feeling cold, dry skin and low mood. An overactive thyroid can cause weight loss, a fast heartbeat, feeling hot, anxiety and trouble sleeping. A swelling in the neck, called a goitre, may also appear. Symptoms often develop slowly and can be subtle.

Many thyroid disorders are caused by autoimmune conditions, in which the immune system affects the gland's activity. Other causes include iodine levels in the diet, certain medicines, thyroid inflammation, nodules and, less commonly, thyroid cancer. Risk is higher in women, with increasing age, with a family history of thyroid disease, and in people with other autoimmune conditions.

Thyroid disorders are usually diagnosed with blood tests that measure thyroid hormone levels and a related hormone from the brain that signals the thyroid. These tests show whether the gland is underactive or overactive. If a lump or swelling is found, an ultrasound scan and sometimes a sample of cells may be taken to look at the gland more closely and guide care.

Treatment depends on the specific disorder. An underactive thyroid is generally managed by replacing the missing hormone, while an overactive thyroid may be treated with medicines that reduce hormone production or other approaches. Nodules and swellings are monitored or treated according to their cause. Care is individual and often involves regular blood tests to keep hormone levels in the right range.

Many thyroid disorders cannot be prevented, particularly those caused by autoimmune conditions. However, getting enough iodine through a balanced diet helps prevent some thyroid problems in areas where iodine is lacking. Being aware of symptoms, knowing your family history and seeking timely advice mean that thyroid disorders can be identified and managed early, reducing their impact on daily life.