Hyperthyroidism
Hyperthyroidism means thyroid hormone levels are too high. A racing heart, tremor, heat intolerance, weight loss or anxiety can be warning signs. Overactive thyroid requires timely medical evaluation; lifestyle measures alone are not a treatment for the hormone excess.
What can cause hyperthyroidism?
Graves’ disease, hormone-producing nodules, thyroid inflammation and excessive replacement hormone are different possibilities. Treatment depends on the cause. A low TSH is a clue, not a complete explanation; free T4, T3 and selected antibody or imaging tests may help the treating clinician distinguish these conditions.
When is specialist care important?
An endocrinologist can evaluate the cause and discuss medication, radioactive iodine or surgery where appropriate. We do not claim to perform those treatments. Pregnancy, eye symptoms, heart disease and significant symptoms make coordinated medical care especially important.
When should you seek urgent help?
Seek emergency care for chest pain, fainting, severe breathlessness, or high fever with confusion and a very fast heartbeat. Do not wait for a discovery call. Do not stop or alter prescribed thyroid or antithyroid medication based on an educational article.
What different tests can and cannot answer
| Clinical question | Possible starting point | Important limitation |
|---|---|---|
| Is thyroid function abnormal? | TSH, with free T4 as appropriate | Interpretation depends on context, medicines and pregnancy. |
| Is autoimmunity involved? | Selected thyroid antibody tests | Positive antibodies do not establish the degree of hormone deficiency. |
| Is there a structural lump? | Examination and ultrasound, with specialist assessment | Normal hormone tests do not exclude an important nodule. |
| Does a food cause allergy? | Reaction history and appropriately selected allergist testing | A food IgG panel cannot diagnose or exclude allergy. |
| Are stress symptoms an adrenal disease? | Medical history and validated testing when indicated | “Adrenal fatigue” is not an established diagnosis. |
Questions and answers
What can cause hyperthyroidism?
Graves’ disease, hormone-producing nodules, thyroid inflammation and excessive replacement hormone are different possibilities. Treatment depends on the cause. A low TSH is a clue, not a complete explanation; free T4, T3 and selected antibody or imaging tests may help the treating clinician distinguish these conditions.
When should you seek urgent help?
Seek emergency care for chest pain, fainting, severe breathlessness, or high fever with confusion and a very fast heartbeat. Do not wait for a discovery call. Do not stop or alter prescribed thyroid or antithyroid medication based on an educational article.
Sources and further reading
- American Thyroid Association: Thyroid hormone treatment
- American Thyroid Association: Hashimoto’s thyroiditis
- NIDDK: Thyroid tests
- American Thyroid Association: Thyroid function tests
- NIDDK: Hashimoto’s disease
- NIDDK: Graves’ disease
- American Thyroid Association: Thyroid nodules
- Endocrine Society: Adrenal fatigue
- AAAAI: Limits of food IgG panel testing
- NIDDK: Diagnosis of celiac disease
- American Thyroid Association: Hypothyroidism during pregnancy
Educational information only, not medical advice, diagnosis or a treatment plan. Do not stop, start or change prescribed medication based on this resource. Pregnancy, children, significant heart symptoms and complex endocrine disease require appropriate medical care. Seek emergency help for chest pain, severe breathing difficulty, fainting, or high fever with confusion and a very fast heartbeat. A discovery call is not urgent medical care.