--- title: "Hypothyroidism: Symptoms & Treatment | infoMD" description: "Hypothyroidism causes fatigue. Learn about symptoms, diagnosis, treatment options, and how to manage hypothyroidism with guidance from medical experts." lang: en json-ld: | [ { "@context": "https://schema.org", "@type": "MedicalCondition", "name": "Hypothyroidism", "alternateName": [ "Underactive Thyroid", "Low Thyroid" ], "description": "Hypothyroidism occurs when the thyroid gland doesn't produce enough thyroid hormones, slowing down the body's metabolism. This causes a wide range of symptoms including fatigue, weight gain, cold intolerance, and depression that often develop so gradually they go unnoticed for years.", "associatedAnatomy": { "@type": "AnatomicalSystem", "name": "Endocrine" }, "signOrSymptom": [ { "@type": "MedicalSignOrSymptom", "name": "Fatigue" }, { "@type": "MedicalSignOrSymptom", "name": "Weight gain" }, { "@type": "MedicalSignOrSymptom", "name": "Cold intolerance" }, { "@type": "MedicalSignOrSymptom", "name": "Dry skin and hair" }, { "@type": "MedicalSignOrSymptom", "name": "Depression" }, { "@type": "MedicalSignOrSymptom", "name": "Constipation" } ], "possibleTreatment": [ { "@type": "MedicalTherapy", "name": "Take thyroid medication on an empty stomach, 30-60 minutes before eating" }, { "@type": "MedicalTherapy", "name": "Maintain consistent timing of medication each day" }, { "@type": "MedicalTherapy", "name": "Eat a balanced diet with adequate iodine, selenium, and zinc" }, { "@type": "MedicalTherapy", "name": "Exercise regularly to combat fatigue and support metabolism" }, { "@type": "MedicalTherapy", "name": "Manage stress, which can worsen symptoms" }, { "@type": "MedicalTherapy", "name": "Avoid excessive soy and high-fiber foods near medication time (they can interfere with absorption)" }, { "@type": "MedicalTherapy", "name": "Levothyroxine (Synthroid, Levoxyl) - synthetic T4, the standard treatment" }, { "@type": "MedicalTherapy", "name": "Liothyronine (Cytomel) - synthetic T3, occasionally added to levothyroxine" }, { "@type": "MedicalTherapy", "name": "Natural desiccated thyroid (Armour Thyroid) - derived from animal thyroid glands" }, { "@type": "MedicalTherapy", "name": "Dose adjustments based on regular TSH monitoring every 6-8 weeks initially" } ], "riskFactor": [ { "@type": "MedicalRiskFactor", "name": "Being female (5-8 times more common in women)" }, { "@type": "MedicalRiskFactor", "name": "Age over 60" }, { "@type": "MedicalRiskFactor", "name": "Family history of thyroid disease" }, { "@type": "MedicalRiskFactor", "name": "Having another autoimmune disease (type 1 diabetes, celiac disease, lupus)" }, { "@type": "MedicalRiskFactor", "name": "Previous thyroid surgery or radiation treatment" }, { "@type": "MedicalRiskFactor", "name": "Pregnancy or recent childbirth" }, { "@type": "MedicalRiskFactor", "name": "Turner syndrome or Down syndrome" } ], "typicalTest": "Physical examination, blood tests, and imaging studies" }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "Can hypothyroidism cause weight gain?", "acceptedAnswer": { "@type": "Answer", "text": "Yes, hypothyroidism can cause modest weight gain - typically 5-10 pounds - mainly due to water and salt retention rather than fat accumulation. While hypothyroidism slows metabolism, significant weight gain is more likely caused by other factors. Once thyroid levels are normalized with medication, excess water weight is usually lost. If you continue to gain weight after treatment, discuss other potential causes with your doctor." } }, { "@type": "Question", "name": "Is hypothyroidism permanent?", "acceptedAnswer": { "@type": "Answer", "text": "In most cases, hypothyroidism caused by Hashimoto's thyroiditis or thyroid surgery is permanent and requires lifelong treatment. However, some forms - such as postpartum thyroiditis or medication-induced hypothyroidism - may be temporary. Subclinical hypothyroidism sometimes resolves on its own. Your doctor will monitor your levels to determine if ongoing treatment is needed." } }, { "@type": "Question", "name": "Can I eat normally with hypothyroidism?", "acceptedAnswer": { "@type": "Answer", "text": "Yes, most people with hypothyroidism can eat a normal, balanced diet. However, take your thyroid medication on an empty stomach and wait before eating. Some foods - particularly soy products, high-fiber foods, and calcium-rich foods - can interfere with medication absorption if consumed too close to your dose. Cruciferous vegetables (broccoli, kale) are safe in normal amounts." } }, { "@type": "Question", "name": "How long does it take for thyroid medication to work?", "acceptedAnswer": { "@type": "Answer", "text": "Most people begin to feel improvement within 1-2 weeks of starting levothyroxine, but it takes 4-6 weeks for the medication to reach its full effect. Your doctor will recheck your TSH levels at 6-8 weeks and adjust the dose if needed. It may take several months to find the optimal dose. Be patient and keep all follow-up appointments." } } ] }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://infomd.com" }, { "@type": "ListItem", "position": 2, "name": "Conditions", "item": "https://infomd.com/conditions" }, { "@type": "ListItem", "position": 3, "name": "Endocrine", "item": "https://infomd.com/conditions/body-system/endocrine" }, { "@type": "ListItem", "position": 4, "name": "Hypothyroidism", "item": "https://infomd.com/conditions/hypothyroidism" } ] } ] --- [Skip to main content](#main-content) [![infoMD](/assets/infomd-logo-CtvTblFD.png)](/) [Home](/) [Conditions](/conditions) [Glossary](/glossary)[Shop](/shop) 1. [Home](/) 2. [Conditions](/conditions) 3. [Endocrine](/conditions/body-system/endocrine) 4. Hypothyroidism Endocrine [Hormones](/topics/hormones)[Women's Health](/topics/womens-health) # Hypothyroidism Also known as: Underactive Thyroid, Low Thyroid infoMD Editorial Team January 30, 2025 8 min read Share: [](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Finfomd.com%2Fconditions%2Fhypothyroidism)[](https://twitter.com/intent/tweet?url=https%3A%2F%2Finfomd.com%2Fconditions%2Fhypothyroidism&text=Hypothyroidism) ### Quick Facts Type Chronic Affects Women over 60 most commonly, though it can occur at any age Prevalence Affects approximately 5% of Americans aged 12 and older Treatable Highly treatable with daily thyroid hormone replacement medication See a Specialist Endocrinologist ICD-10 Code E03 ## Overview Hypothyroidism is a condition in which the thyroid gland - a small, butterfly-shaped gland at the base of your neck - doesn't produce enough thyroid hormones. These hormones regulate your body's metabolism, affecting virtually every organ system. When thyroid hormone levels are too low, your body's processes slow down. The most common cause of hypothyroidism in the United States is Hashimoto's thyroiditis, an autoimmune condition in which the immune system gradually destroys the thyroid gland. Other causes include thyroid surgery, radiation therapy, certain medications, and iodine deficiency. Symptoms develop gradually and are often attributed to aging, stress, or other conditions, leading to delayed diagnosis. The good news is that hypothyroidism is one of the most treatable chronic conditions in medicine. Daily thyroid hormone replacement medication restores normal hormone levels, effectively reversing symptoms. With proper treatment and regular monitoring, people with hypothyroidism can live completely normal, healthy lives. ## Symptoms Recognizing the symptoms of hypothyroidism early can lead to faster diagnosis and better outcomes. ### Early Symptoms - Fatigue and sluggishness - Increased sensitivity to cold - Unexplained weight gain - Dry skin and brittle nails - Constipation - Puffy face ### Advanced Symptoms - Thinning hair and hair loss - Slowed heart rate - Depression and mood changes - Memory problems and difficulty concentrating - Muscle weakness, aches, and stiffness - Heavy or irregular menstrual periods - Elevated cholesterol levels - Hoarse voice ### Emergency Warning Signs - Myxedema coma - extreme drowsiness, confusion, and hypothermia (rare but life-threatening) - Severe depression with suicidal thoughts When to See a Doctor See a doctor if you experience persistent fatigue, unexplained weight gain, increased sensitivity to cold, or dry skin that doesn't improve with moisturizers. These symptoms develop gradually, so it's important to mention even subtle changes at your routine checkups. ## Causes & Risk Factors ### Common Causes - Hashimoto's thyroiditis (autoimmune destruction of the thyroid) - Thyroid surgery (partial or total thyroidectomy) - Radiation therapy to the head and neck area - Certain medications (lithium, amiodarone, interferon alpha) - Iodine deficiency (rare in developed countries) - Congenital hypothyroidism (born without a functioning thyroid) - Pituitary gland disorders ### Risk Factors - Being female (5-8 times more common in women) - Age over 60 - Family history of thyroid disease - Having another autoimmune disease (type 1 diabetes, celiac disease, lupus) - Previous thyroid surgery or radiation treatment - Pregnancy or recent childbirth - Turner syndrome or Down syndrome ## How It's Diagnosed Hypothyroidism is diagnosed primarily through blood tests. The thyroid-stimulating hormone (TSH) test is the most sensitive screening tool - elevated TSH levels indicate the pituitary gland is working harder to stimulate an underperforming thyroid. A free T4 (thyroxine) test measures the actual amount of thyroid hormone available in the blood; low levels confirm hypothyroidism. Your doctor may also order thyroid antibody tests (anti-TPO and anti-thyroglobulin) to check for Hashimoto's thyroiditis as the underlying cause. In some cases, a thyroid ultrasound may be performed to evaluate the size and structure of the gland. Diagnosis is usually straightforward once the blood tests are done, and your doctor will determine the severity - subclinical (mildly elevated TSH with normal T4) versus overt hypothyroidism. ## Treatment Options ### Lifestyle Changes - Take thyroid medication on an empty stomach, 30-60 minutes before eating - Maintain consistent timing of medication each day - Eat a balanced diet with adequate iodine, selenium, and zinc - Exercise regularly to combat fatigue and support metabolism - Manage stress, which can worsen symptoms - Avoid excessive soy and high-fiber foods near medication time (they can interfere with absorption) ### Medications - Levothyroxine (Synthroid, Levoxyl) - synthetic T4, the standard treatment - Liothyronine (Cytomel) - synthetic T3, occasionally added to levothyroxine - Natural desiccated thyroid (Armour Thyroid) - derived from animal thyroid glands - Dose adjustments based on regular TSH monitoring every 6-8 weeks initially ### Complementary Approaches - Selenium supplements may support thyroid function in Hashimoto's patients - Stress reduction techniques to support overall hormonal balance - Vitamin D supplementation (deficiency is common in thyroid patients) - Gluten-free diet may benefit some Hashimoto's patients (evidence is limited) ## Living With Hypothyroidism Living with hypothyroidism is generally straightforward once you find the right medication dose. Most people take a single daily pill of levothyroxine and feel completely normal. However, finding the optimal dose can take several months of adjustments, so patience is important during the initial treatment phase. Regular blood tests - typically every 6-12 months once stable - ensure your dose remains appropriate. Some people notice that certain life changes affect their thyroid medication needs. Pregnancy, significant weight changes, menopause, and starting or stopping other medications can all require dose adjustments. Keeping your endocrinologist informed about changes in your health and being consistent about annual thyroid checks are the most important steps in long-term management. ## Potential Complications - Goiter - enlarged thyroid gland - Heart disease from elevated cholesterol - Peripheral neuropathy (nerve damage in hands and feet) - Infertility and pregnancy complications - Myxedema coma (rare, life-threatening emergency) - Mental health issues including depression - Birth defects in babies born to untreated mothers ## Prevention - Get regular thyroid screening if you have risk factors - Ensure adequate iodine intake through iodized salt and seafood - Monitor thyroid function during and after pregnancy - Be aware of medications that affect thyroid function - If you have Hashimoto's, follow your treatment plan to prevent progression ## Frequently Asked Questions ### Can hypothyroidism cause weight gain? ### Is hypothyroidism permanent? ### Can I eat normally with hypothyroidism? ### How long does it take for thyroid medication to work? * * * ## Sources 1. Hypothyroidism (Underactive Thyroid). Mayo Clinic . 2. Hypothyroidism. National Institute of Diabetes and Digestive and Kidney Diseases . 3. Thyroid Disease. American Thyroid Association . 4. Hypothyroidism. Cleveland Clinic . Medical Disclaimer This content is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Reviewed By infoMD Editorial Team Last reviewed: March 20, 2025 In This Article [Overview](#overview)[Symptoms](#symptoms)[Causes & Risk Factors](#causes-risk-factors)[How It's Diagnosed](#how-it-s-diagnosed)[Treatment Options](#treatment-options)[Living With Hypothyroidism](#living-with-hypothyroidism)[Potential Complications](#potential-complications)[Prevention](#prevention)[Frequently Asked Questions](#frequently-asked-questions)[Sources](#sources) ### Quick Facts Type Chronic Affects Women over 60 most commonly, though it can occur at any age Prevalence Affects approximately 5% of Americans aged 12 and older Treatable Highly treatable with daily thyroid hormone replacement medication See a Specialist Endocrinologist ICD-10 Code E03 Advertisement Was this page helpful? Yes No ## Related Conditions [ ### Polycystic Ovary Syndrome Endocrine PCOS is a hormonal disorder causing enlarged ovaries with small cysts on the outer edges. 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