Medication
Bedtime Dosing of Levothyroxine: When It Actually Makes Sense
Bedtime levothyroxine can lower TSH more than morning dosing in some people. See what the trials show and when night dosing actually fits.
Biotin and Thyroid Labs: Why Your Supplement May Be Skewing Your Results
High-dose biotin supplements cause falsely low TSH and falsely high T3/T4 on standard lab tests. The FDA warned about this in 2017. Here's what to do.
Calcium, Iron, and Levothyroxine: The 4-Hour Rule
Calcium and iron levothyroxine interactions can cut absorption by 25-30% and push TSH from 1.6 to 5.4. Why the 4-hour rule matters and how to apply it.
Coffee and Levothyroxine Timing: The 60-Minute Window
Coffee levothyroxine timing matters more than most patients are told. Benvenga 2008 found about 36% less T4 absorption when taken together. Wait 60 min.
Fiber Supplements and Levothyroxine: The 4-Hour Rule That Protects Your Dose
Dietary fiber and fiber supplements like psyllium can bind levothyroxine in the gut and reduce absorption. Learn the simple timing rule that prevents this.
Generic vs Brand Levothyroxine: Does It Matter?
Generic vs brand levothyroxine: neither is inherently better. The FDA calls it a narrow-therapeutic-index drug, so consistency and TSH retesting matter most.
Fatigue in Hashimoto's: Why It Persists and What Helps
Hashimoto's fatigue often persists even with normal TSH. See the multi-factor explanation — inflammation, mitochondria, microbiome, sleep — and what evidence-based steps help.
Hashitoxicosis: The Hyperthyroid Phase of Hashimoto's
Hashitoxicosis is the temporary hyperthyroid phase that can occur in Hashimoto's. See how it differs from Graves' and how it's treated.
Hyperthyroidism and Graves' Disease: The Other Side of Thyroid Autoimmunity
Graves' disease is the most common cause of hyperthyroidism — driven by TRAb antibodies, treatable, and most patients eventually need levothyroxine.
Brain Fog in Hypothyroidism: What's Happening and What Helps
Brain fog in hypothyroidism is real, measurable, and usually improves on adequate levothyroxine — but cognition recovers slower than energy. Here's the timeline and what to do when fog persists.
Depression and Hypothyroidism: What's Real, What Helps, and When to Look Elsewhere
Depression is real in hypothyroidism and usually lifts on adequate levothyroxine. See the timeline, when to check thyroid in treatment-resistant depression, and what doesn't help.
Hair Loss in Hypothyroidism: What to Expect on Levothyroxine
Hair loss is common in hypothyroidism and usually resolves on adequate levothyroxine — but slowly. See what to expect and what doesn't help.
Hypothyroidism and Sleep: Why Rest Doesn't Restore — and What Helps
Hypothyroidism disrupts sleep in both directions — daytime sleepiness and insomnia — and quietly raises sleep apnea risk. See what helps and when to ask for a sleep study.
Hypothyroid Weight Gain: How Much, Why, and What Helps
Hypothyroid weight gain is usually 5–10 lbs, mostly fluid. Levothyroxine reverses the fluid and normalizes metabolism, but the rest takes the same work as anyone else.
Levothyroxine on an Empty Stomach: Why Timing Matters
Levothyroxine empty stomach: why it matters. Acidic, food-free conditions let the tablet dissolve and reach the small intestine for 70-80% absorption.
Levothyroxine and Pregnancy: Why Your Dose Almost Always Goes Up
Most pregnant women on levothyroxine need a 20–50% dose increase by week 8. See the ATA pregnancy guidelines and how to manage thyroid medication trimester by trimester.
Liothyronine (T3) Alone: Who It's Actually For
Liothyronine (T3-only) is rarely first-line for hypothyroidism, and the major guidelines explain why. See when it makes sense and why levothyroxine is the default.
Liquid and Soft-Gel Levothyroxine vs. Tablets: What the Absorption Data Shows
Liquid and soft-gel levothyroxine are absorbed differently than tablets. See when they're worth the cost and when tablets are fine.
Postpartum Thyroiditis: What to Watch For After Delivery
Postpartum thyroiditis affects ~5% of women in the first year after delivery. See the typical course, who's at risk, and when to treat.
Proton Pump Inhibitors and Levothyroxine: Why Your Heartburn Drug May Be Raising Your TSH
PPIs like omeprazole and pantoprazole raise stomach pH and impair levothyroxine absorption. Learn how to manage this clinically important drug interaction.
Subclinical Hypothyroidism: Treat or Watch?
Subclinical hypothyroidism — high TSH with normal free T4 — doesn't always need treatment. See what the trials and guidelines actually say.
T3/T4 Combination Therapy: Is Adding Liothyronine Right for You?
Still feeling unwell on levothyroxine with a normal TSH? Learn what the research says about adding T3 (liothyronine) and who may actually benefit.
TSH, Free T4, Free T3, Antibodies: Which Thyroid Blood Tests to Ask For
TSH is the standard thyroid screening test, but free T4, free T3, and antibody panels each answer different questions. See which to ask for and when.
Life After Thyroid Cancer: TSH Suppression, Surveillance, and What to Expect
After differentiated thyroid cancer, levothyroxine doubles as hormone replacement and TSH suppression. See risk-stratified targets, surveillance routine, and when suppression can relax.
GLP-1 Drugs (Ozempic, Wegovy, Mounjaro) and Thyroid Disease
GLP-1 drugs like Ozempic and Mounjaro work for weight loss in hypothyroid and Hashimoto's patients — but a family history of medullary thyroid cancer or MEN2 is an absolute contraindication. What to know.
Deiodinases: How Your Body Turns Levothyroxine Into Active T3
T4 is a prohormone. Deiodinase enzymes convert it to active T3 in your tissues. Here's how that system works — and what it means if you don't feel well on levothyroxine.
TPO Antibodies: What They Mean and Why Their Number Usually Doesn't Change Treatment
Anti-TPO antibodies confirm Hashimoto's and predict progression to overt hypothyroidism, but their number rarely changes month-to-month management.
Thyroid and Menopause: How Symptoms Overlap and HRT Changes Your Dose
Hypothyroidism and menopause share a lot of symptoms — and starting HRT can change your levothyroxine dose. See how to tell them apart and what to test.
Thyroid Hormone and Mitochondria: Why Hypothyroidism Drains Your Cellular Battery
T3 directly regulates mitochondrial biogenesis and ATP production. See what recovers on levothyroxine, what doesn't, and where supplements like CoQ10 and carnitine actually stand.
Thyroid Nodules: When to Worry, When to Watch
Most thyroid nodules are benign and grow slowly. See what the ATA guidelines say about which nodules need biopsy and which can be watched.
Thyroid Disease and PCOS: The Overlap Most People Miss
Hashimoto's and PCOS overlap far more than chance. See the shared mechanisms, what to test, and how treatment differs for each.
Thyroid, Fertility and Pregnancy: What Matters Before, During, and After
Untreated hypothyroidism reduces fertility and raises miscarriage risk. Pre-conception TSH, the pregnancy dose surge, trimester targets, and postpartum monitoring — explained.
Resmetirom (Rezdiffra) for Fatty Liver: What Thyroid Patients Should Know
Resmetirom (Rezdiffra) is FDA-approved for MASH with fibrosis — not for hypothyroidism. Here is what it actually does and why thyroid patients ask about it.
Hashimoto's Thyroiditis and Type 1 Diabetes: The Autoimmune Cluster
About 1 in 4 adults with type 1 diabetes also have thyroid antibodies. See how Hashimoto's and T1D cluster, what to screen for, and how levothyroxine and insulin interact.
Life After Thyroidectomy: Managing Without a Thyroid
After thyroidectomy, lifelong levothyroxine and stable monitoring become routine. See what to expect and the TSH targets that matter.