Hypothyroidism, in one line
Hypothyroidism is a condition in which the thyroid gland does not make enough thyroid hormone to keep the body running at a normal pace. It is common, more frequent in women and older adults, and most often caused by Hashimoto's thyroiditis. It is confirmed with a TSH blood test and treated with a daily levothyroxine tablet. (NIDDK)
What is hypothyroidism?
Hypothyroidism means the thyroid gland is not making enough thyroid hormone to keep the body running at a normal pace. It is common, especially as people get older, and it is more frequent in women. The most common cause is Hashimoto's thyroiditis, an autoimmune condition in which the body's own immune system gradually slows the thyroid. Typical symptoms include fatigue, weight gain, feeling cold, dry skin, constipation, and brain fog or low mood. Because these symptoms are nonspecific, the diagnosis is confirmed with a blood test — usually TSH, sometimes with Free T4. Once diagnosed, hypothyroidism is very treatable with a daily thyroid hormone tablet, and most people feel substantially better once their levels are in range.
How common is hypothyroidism?
Hypothyroidism is common in the United States: about 4.6% of people aged 12 and older have it — roughly 0.3% overt and 4.3% subclinical, per NHANES III (StatPearls). Hashimoto's thyroiditis is the most common cause in the U.S. (NIDDK). Because it is so widespread and largely managed through refills and periodic labs, much of routine thyroid care fits well into telehealth.
How online thyroid care works
You complete a secure online intake describing your diagnosis, current medication and dose, most recent labs, symptoms, interacting medications, and pharmacy preference. A licensed physician reviews the information and may follow up if more detail is needed. If you have established, stable hypothyroidism with recent labs, the clinician can send a levothyroxine prescription to your pharmacy. If your labs are not current, Start & Confirm includes a TSH so the clinician can review your levels before prescribing.
Vyta.co manages straightforward hypothyroidism — it does not work up complex or undifferentiated thyroid disease. If your answers suggest hyperthyroidism, a nodule or mass, thyroid cancer, pregnancy, or any picture that needs specialist-level care, the clinician will refer you for in-person evaluation at no charge.
Curious about the mechanics? Read our guides to how online prescriptions work and getting a refill without a video visit.
Management, not diagnosis
Clinician-reviewed
Labs included
When online thyroid care is appropriate
Telehealth may be appropriate for adults with established, stable hypothyroidism who need ongoing levothyroxine refills and routine monitoring — or for symptomatic adults whose labs confirm straightforward, uncomplicated hypothyroidism.
Because thyroid symptoms overlap with other conditions and only labs confirm the diagnosis, your clinician reviews your history and TSH before deciding whether treatment is clinically appropriate.
When to see a doctor in person
Online management is not right for every thyroid situation. Seek in-person care if any of the following apply.
- Pregnancy, or planning pregnancy within the next six months
- A history of thyroid cancer, or thyroid nodules or masses
- Hyperthyroidism or Graves' disease, or symptoms of an overactive thyroid (racing heart, tremor, unexplained weight loss)
Levothyroxine: how treatment works
Levothyroxine is a synthetic form of the thyroid hormone T4 and is the standard first-line treatment for hypothyroidism. It is taken once daily, ideally on an empty stomach 30 to 60 minutes before breakfast, because food and certain supplements affect absorption. Calcium, iron, antacids, and proton-pump inhibitors (PPIs) should be separated from your dose by several hours. The clinician starts conservatively and adjusts based on your symptoms and labs, rechecking your TSH about 6 to 8 weeks after any dose change.
Take levothyroxine consistently and tell your clinician about new medications or supplements, since they can change how much you absorb. If you have symptoms of too much thyroid hormone — a racing heart, tremor, trouble sleeping, or unexplained weight loss — let your clinician know, as your dose may need to come down. Your clinician chooses the dose and monitoring plan based on your individual situation.
What causes hypothyroidism?
The most common cause is Hashimoto's thyroiditis, an autoimmune condition. Other causes include prior thyroid surgery, radioactive iodine treatment, certain medications, and, less commonly, problems with the pituitary gland. Risk is higher with a family history of thyroid or autoimmune disease, with older age, and in women. Hypothyroidism is usually a lifelong condition, which is why steady refills and periodic monitoring matter more than a one-time fix.
Labs & monitoring
TSH is the main test used to diagnose hypothyroidism and to guide dosing, sometimes alongside Free T4. Once your dose is stable, most adults need a TSH check about once a year — the American Thyroid Association suggests every 6 to 12 months once stable. After any dose change, your clinician rechecks sooner, usually in 6 to 8 weeks. The membership includes one monitoring TSH per year; any additional labs are billed at cost.