January is Thyroid Awareness Month, a time to highlight a small but powerful gland that plays a major role in overall health. The thyroid affects energy levels, metabolism, heart function, mood, weight, and even cognitive performance. When it is underactive—a condition known as hypothyroidism—the effects can be widespread and often overlooked.

At Sonoran MD, we frequently see patients who have symptoms for months or years before thyroid dysfunction is properly identified. Understanding the signs and knowing what labs are needed can make a significant difference.

Common Symptoms of Hypothyroidism

Hypothyroidism occurs when the thyroid does not produce enough thyroid hormone. Symptoms can be subtle at first and are often mistaken for stress, aging, or other medical conditions.

Common symptoms include:

• Fatigue or low energy
• Weight gain despite no change in diet or activity
• Cold intolerance
• Constipation
• Dry skin and hair thinning
• Depression, brain fog, or memory issues
• Slow heart rate
• Muscle aches or weakness
• Menstrual irregularities or fertility issues

Because these symptoms are nonspecific, blood testing is essential for diagnosis.

Why TSH Alone Is Not Enough

Many patients are familiar with TSH (thyroid-stimulating hormone) testing. While TSH is an important screening tool, it does not provide the full picture of thyroid health.

TSH reflects how strongly the brain is signaling the thyroid—but it does not measure how much thyroid hormone is actually available to the body’s tissues.

A patient can have a “normal” TSH level yet have ongoing symptoms of hypothyroidism. This can result in inadequate active thyroid hormone at the cellular level.

This is why additional thyroid hormone testing is often necessary.

Essential Thyroid Labs for a Complete Evaluation

At Sonoran MD, a comprehensive thyroid assessment may include:

1. Free T4 (Thyroxine)

• This is the primary hormone produced by the thyroid.
• Free T4 reflects the hormone available to tissues.
• Low Free T4 can explain symptoms even when TSH is borderline.

2. Free T3 (Triiodothyronine)

• T3 is the active hormone that drives metabolism and energy.
• Some patients do not convert T4 to T3 efficiently.
• Low T3 can cause symptoms despite “normal” TSH and T4.

3. Thyroid Antibodies

• TPO antibodies and thyroglobulin antibodies help identify autoimmune thyroid disease (Hashimoto’s).
• Autoimmune thyroid disease can cause fluctuating thyroid levels and progressive dysfunction.

4. Additional Supportive Labs

Thyroid symptoms can overlap with or be worsened by:

• Iron deficiency
• Vitamin B12 deficiency
• Low cortisol
• Iodine imbalance

Evaluating these factors in conjunction with a thorough health assessment helps ensure accurate diagnosis and effective treatment.

The Sonoran MD Approach

Thyroid care should be individualized, not based on a single lab value. At Sonoran MD, we focus on:

• Symptoms + labs together
• Comprehensive thyroid hormone testing
• Identifying underlying causes
• Ongoing monitoring and patient education

If you have persistent fatigue, unexplained weight changes, or other symptoms of hypothyroidism—even with “normal” labs—it may be time for a more thorough evaluation.

Takeaway

• Hypothyroidism is common and often underdiagnosed
• Symptoms can be vague but impactful
• TSH alone does not tell the full story
• Testing thyroid hormones, including Free T4, is essential
• Comprehensive care leads to better outcomes

During Thyroid Awareness Month, we encourage patients to ask questions, understand their labs, and advocate for thorough evaluation.

If you have concerns about your thyroid health, Sonoran MD is here to help.