Untreated goitres may progressively enlarge, potentially compressing surrounding structures. Large goitres can compress the windpipe (trachea), which may cause breathing difficulties that could worsen when lying down or raising arms above the head. Severe cases might require emergency intervention to keep the airway open.
Food pipe (oesophageal) compression from posterior goitre growth can cause progressive swallowing difficulties, starting with solid foods and potentially advancing to liquids. This may lead to weight loss, malnutrition, and aspiration risks in severe cases.
Long-standing goitres may develop areas of bleeding or degeneration, causing sudden painful enlargement. Substernal extension, where the goitre grows behind the breastbone, can complicate future surgical treatment and may increase operative risks.
Toxic goitres left untreated may lead to prolonged overactive thyroid (hyperthyroidism) complications, including irregular heart rhythm (atrial fibrillation), bone thinning (osteoporosis), and rarely, life-threatening thyroid storm. The heart effects may particularly concern elderly patients who could develop heart failure from sustained rapid heart rates.
Whilst most goitres are benign, untreated nodules require monitoring as some may harbour thyroid cancer. Delayed diagnosis of cancer could allow potential spread, requiring more extensive treatment. Consult with a healthcare professional for proper evaluation and management.