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Fatigue, Weight Gain, Brain Fog? It Could Be Hashimoto's.

Hashimoto's is the most common cause of hypothyroidism — and it's frequently missed by standard thyroid testing.

Reviewed by McKell Johnson, FNP-BC, Clinical Director · Originally developed by Dr. Justin Abbott, D.O., Founder
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What's Behind It

What Hashimoto's Actually Is

Hashimoto's thyroiditis is an autoimmune condition where the immune system gradually attacks the thyroid gland, slowing hormone production over time. It's the leading cause of hypothyroidism in the United States.

Standard thyroid panels (just TSH) often miss it. A full thyroid antibody panel is usually needed to catch Hashimoto's early — before symptoms become severe.

Common Hashimoto's Symptoms

Persistent fatigue
Unexplained weight gain
Brain fog or difficulty concentrating
Cold intolerance
Dry skin and hair thinning
Depression or low mood
How We Approach It

Testing Beyond the Standard Panel

We run a full thyroid panel — including antibodies, not just TSH — to catch Hashimoto's accurately. Treatment addresses both the thyroid and the underlying autoimmune activity.

What To Expect

What a Hashimoto's Workup Can Include

Hashimoto's is diagnosed with blood work, not symptoms alone. A thorough evaluation typically looks at TSH, free T4 and free T3, plus thyroid peroxidase (TPO) and thyroglobulin antibodies. Depending on your symptoms and history, your provider may also check related markers such as vitamin D, B12, iron stores and blood sugar.

Results are reviewed with you in person at our Salina clinic, and treatment is individualized. For some patients that means thyroid hormone replacement with follow-up labs. For others it also means looking at sleep, nutrition, stress and other factors that can affect how you feel. Not everyone with positive antibodies needs medication right away, so monitoring is part of the plan.

Want to read more first? See why "normal" thyroid labs aren't always normal, where standard thyroid testing falls short, and what to do if you're tired with normal labs. Weight changes are common with thyroid problems, and our unexplained weight gain page explains how we approach them.

From Our Care Team

Hashimoto's gets missed constantly because most standard panels only check TSH. If your thyroid antibodies were never tested, you may not have the full picture yet.

Reviewed for accuracy by McKell Johnson, FNP-BC, Clinical Director, and the Abbott Health & Wellness care team.

Related Conditions

Often connected to Hashimoto's: thyroid problems, weight gain, cold hands & feet, and chronic fatigue. Why "normal" thyroid labs aren’t always normal → Still tired with "normal" labs? →

What Patients Say
Common Questions

Hashimoto's FAQs

What patients ask most before their first appointment.

Hashimoto's thyroiditis is an autoimmune condition where the immune system attacks the thyroid gland, gradually reducing its ability to produce hormones. It's the most common cause of hypothyroidism in the U.S.
Standard thyroid screening often only checks TSH levels, which can appear normal in early Hashimoto's. A full panel including thyroid antibodies (TPO and thyroglobulin) is needed to accurately diagnose it.
Yes. While there's no cure for the autoimmune process itself, thyroid hormone levels can be optimized and monitored, and addressing underlying triggers can help reduce symptoms and slow progression.
Along with TSH, ask about free T4, free T3, TPO antibodies and thyroglobulin antibodies. TSH alone can look normal while antibodies are already elevated. Your provider decides what to order based on your symptoms and history.
Yes. When the thyroid underproduces hormone, metabolism can slow, which may contribute to weight gain, fatigue, cold intolerance and brain fog. These symptoms also have other causes, so lab testing is how we sort out what is going on.
Not always. Treatment depends on your thyroid hormone levels, symptoms and history. Some patients start thyroid hormone replacement, while others are monitored with periodic labs. Your provider will explain the options at your visit.
Abbott Health & Wellness is at 45 North State Street in Salina, Utah. Patients come from Richfield, Manti, Gunnison, Ephraim and across Central Utah for thyroid evaluation with McKell Johnson, FNP-BC.
Before You Book

Two Things Worth Knowing

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