Hyperthyroidism
Sources consulted
This article is original patient-education content.
- WHO—Health topics A–Z(2024)
- NHS—Health A to Z(2024)
- CDC—Health topics(2024)
Based on international clinical guidelines
Overview
Hyperthyroidism is a condition where your thyroid gland makes too much thyroid hormone. This hormone controls how your body uses energy, so having too much can speed up your metabolism and cause symptoms like a fast heartbeat, weight loss, and feeling nervous or shaky.
Key facts
- The thyroid is a small, butterfly-shaped gland in your neck.
- Thyroid hormone affects almost every organ in your body.
- Hyperthyroidism can be managed with treatment, often very successfully.
Hyperthyroidism is not extremely common, but it affects about 1 in 100 people in the UK. It is more common in women than in men.
It can happen at any age, but it most often affects people between the ages of 20 and 40. Women are 5 to 10 times more likely to develop it than men.
Symptoms
- Chest pain or tightness
- Severe difficulty breathing
- Fainting or passing out
- A very fast, irregular heartbeat (over 140 beats per minute at rest)
- ⚠A sudden increase in symptoms, such as a racing heart, fever, and agitation (this could be a 'thyroid storm' — a rare but dangerous condition)
- ⚠New or worsening palpitations that last more than a few minutes
- ⚠Severe headache, confusion, or vision changes
Common symptoms
- Fast or irregular heartbeat (palpitations)
- Unexplained weight loss even though you are eating more
- Feeling nervous, anxious, or irritable
- Trembling hands or fingers
- Sweating and feeling hot when others are comfortable
- Tiredness or muscle weakness
- More frequent bowel movements
- Difficulty sleeping
- Thinning hair or changes in your skin
Symptoms in children
- Irritability and mood swings
- Poor school performance or trouble concentrating
- Rapid growth but also weight loss
- Tremors and a fast heartbeat
Symptoms in older adults
- Fatigue and weakness rather than hyperactivity
- Weight loss without increased appetite
- Irregular heart rhythm (atrial fibrillation)
- Confusion or depression
Causes
Main causes
- Graves' disease: an autoimmune condition where your immune system mistakenly attacks your thyroid, causing it to overproduce hormone.
- Thyroid nodules: lumps on the thyroid that can produce too much hormone.
- Thyroiditis: inflammation of the thyroid that can cause stored hormone to leak into the blood.
Risk factors
- Being female
- Having a family history of thyroid disease
- Having other autoimmune conditions, like type 1 diabetes or rheumatoid arthritis
- Smoking (especially for Graves' disease)
When to see a doctor
See a doctor urgently if:
- If you have a fast or irregular heartbeat that does not go away
- If you lose weight without trying and have a poor appetite
- If you feel very anxious, confused, or have a fever along with other symptoms
Book a routine appointment if:
- If you notice a lump or swelling in your neck
- If you have ongoing symptoms like fatigue, heat intolerance, or changes in your energy level
- If you have a family history of thyroid problems and develop any symptoms
Diagnosis
Your doctor will ask about your symptoms, examine your neck, and order blood tests to check your thyroid hormone levels.
Tests that may be done
- Blood tests to measure TSH (thyroid-stimulating hormone) and T4 and T3 (thyroid hormones). In hyperthyroidism, TSH is low and T4/T3 are high.
- A thyroid scan or ultrasound to look at the size and shape of your thyroid and check for nodules or inflammation.
- A radioactive iodine uptake test to see how much iodine your thyroid absorbs (can help find the cause).
What to expect at your appointment
Diagnosis usually involves a blood test first. If results suggest hyperthyroidism, you may have further tests. It can take a few weeks to get all results and a clear diagnosis.
Treatment
Treatment aims to bring your thyroid hormone levels back to normal and relieve symptoms. The right treatment depends on your age, overall health, the cause, and how severe your condition is. Options include medication to lower hormone production, radioactive iodine to shrink the thyroid, or surgery to remove part or all of it.
Self-care at home
- Take any prescribed medicines exactly as directed.
- Learn to recognize signs that your symptoms are getting worse (like a faster heartbeat).
- Avoid too much caffeine and alcohol, which can make symptoms worse.
- Try stress-reducing activities like gentle yoga, meditation, or deep breathing.
- Keep a symptom diary to share with your doctor.
Medical treatments
Your doctor may prescribe medicines that help control your heartbeat or reduce the amount of thyroid hormone your body makes. Another option is radioactive iodine, which you take as a small capsule or liquid. This treatment slowly destroys overactive thyroid tissue. If you are pregnant or breastfeeding, radioactive iodine is not used. In some cases, surgery to remove part or all of the thyroid is recommended. Your doctor will explain the benefits and risks of each option.
When is surgery considered?
Surgery to remove the thyroid may be recommended if you cannot take medications, if you have a large goiter (swollen thyroid) pressing on your neck, or if you have a thyroid nodule that might be cancerous. After surgery, you will need lifelong thyroid hormone replacement.
Living with this condition
Most people with hyperthyroidism can lead a normal life with proper treatment. You may need to take medication daily and have regular check-ups and blood tests. Once your hormone levels are stable, you will feel much better.
Lifestyle tips
- Stay active with regular exercise, but listen to your body and rest when you need to.
- Keep a consistent sleep schedule to help manage fatigue and mood.
- Avoid smoking, as it can worsen Graves' disease.
- Manage stress with relaxation techniques or hobbies you enjoy.
Diet and exercise
Eat a balanced diet with plenty of fruits, vegetables, and whole grains. If you have weight loss, you may need to eat more calories. Avoid iodine supplements or seaweed products, as iodine can make hyperthyroidism worse. Gentle exercise like walking, swimming, or cycling can help improve energy and mood.
Mental health and emotional wellbeing
Hyperthyroidism can cause anxiety, irritability, and mood swings. Once treated, these often improve. But if you continue to feel anxious or depressed, talk to your doctor. Counseling or support groups can help.
Prevention
Hyperthyroidism cannot always be prevented because many causes like autoimmune disease are not avoidable. However, if you have a family history, being aware of symptoms and getting regular check-ups can help catch it early.
Complications
If left untreated
- Heart problems like atrial fibrillation (irregular heartbeat) and heart failure
- Osteoporosis (brittle bones) because too much thyroid hormone can weaken bones
- Thyroid storm: a rare, life-threatening sudden worsening of symptoms that requires emergency care
- Eye problems in Graves' disease, such as bulging eyes, double vision, or vision loss
Long-term outlook
With proper treatment, most people with hyperthyroidism get better and can live a full, healthy life. Treatment is very effective, and serious complications are rare if the condition is managed. Your healthcare team will support you every step of the way.
Find support
International organisations
Local organisations
- NHS – Thyroid Disorders ↗ · United Kingdom
Helplines
External links open third-party websites. Ruqelo Health is not responsible for external content. Listing an organisation does not imply endorsement.
Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.