Differential Diagnosis for Swollen Thyroid Right Side on Exam
- Single Most Likely Diagnosis
- Thyroid nodule or cyst: This is the most common cause of a swollen thyroid gland, particularly when it's unilateral. A nodule or cyst can cause localized swelling and may be detected incidentally on physical examination.
- Other Likely Diagnoses
- Hashimoto's thyroiditis: Although this condition typically causes bilateral thyroid gland swelling, it can sometimes present unilaterally. It's an autoimmune condition that leads to thyroid inflammation and can cause thyroid dysfunction.
- Subacute thyroiditis: This condition is characterized by inflammation of the thyroid gland, often following a viral infection. It can cause unilateral or bilateral thyroid swelling and tenderness.
- Thyroid adenoma: A benign tumor of the thyroid gland, which can cause localized swelling and may be functional (producing thyroid hormones) or non-functional.
- Do Not Miss Diagnoses
- Thyroid cancer: Although less common, thyroid cancer (such as papillary or follicular thyroid cancer) can present as a unilateral thyroid nodule or swelling. It's crucial to consider this diagnosis to ensure timely treatment and management.
- Thyroid abscess: A rare but potentially life-threatening condition caused by a bacterial or fungal infection of the thyroid gland. It requires prompt diagnosis and treatment to prevent serious complications.
- Rare Diagnoses
- Riedel's thyroiditis: A rare form of chronic thyroiditis characterized by fibrosis and inflammation of the thyroid gland, which can cause unilateral or bilateral swelling and hardness of the gland.
- Thyroid hemiagenesis: A rare congenital anomaly where one lobe of the thyroid gland is absent or underdeveloped, which can be mistaken for a swollen thyroid gland on the affected side.
- Ectopic thyroid tissue: Rarely, thyroid tissue can be found in abnormal locations, such as the neck or tongue, and can cause localized swelling or masses.