Testosterone Gets the Headlines… But What About Your Thyroid Health?

When most men think about hormones, they think about testosterone and it’s easy to see why. Testosterone is associated with muscle mass, strength, libido, confidence, motivation, and performance. It’s a hormone that sells because the benefits are easy to market and easy to understand.

But what if I told you that thyroid problems can cause many of the exact same symptoms? Furthermore, thyroid issues can impact testosterone production!

Every week I speak to men who are convinced they have low testosterone because they’re struggling with fatigue, brain fog, reduced libido, poor gym performance, weight gain, and low mood.

Sometimes testosterone is the issue.

Sometimes it isn’t.

In many cases, the thyroid gland deserves far more attention than it gets. It’s not as easy to market, but that doesn’t mean it’s any less important.

What Does the Thyroid Actually Do in Men?

The thyroid is a small butterfly-shaped gland located in the neck, but its influence extends throughout the entire body.

Think of thyroid hormones as the body’s metabolic regulators. They help control:

• Energy production
• Metabolic rate
• Body temperature
• Brain function
• Heart function
• Recovery and repair
• Muscle function
• Hormonal signalling

When thyroid function slows down, virtually every system in the body can feel the effects.

Symptoms of Thyroid Problems in Men

Many of the symptoms of an under active thyroid can look remarkably similar to low testosterone:

• Fatigue and low energy
• Reduced motivation
• Low mood
• Brain fog and poor concentration
• Reduced libido
• Erectile dysfunction
• Weight gain
• Difficulty losing body fat
• Poor exercise recovery
• Reduced strength and performance
• Increased sensitivity to cold
• Dry skin and hair changes

It’s not uncommon for men to spend years focusing solely on testosterone while an underlying thyroid issue goes unnoticed.

In practice, I often see men present with thyroid issues when they’re suspecting low testosterone, or they’re on TRT but things aren’t responding as hoped.

These men often report lagging energy as the day goes on, brain fog, or just a blunt mood.

The Relationship Between the Thyroid and Testosterone

Hormones don’t operate independently.

The thyroid has important relationships with several other hormone systems including:

Testosterone

Poor thyroid function can negatively impact testicular function and testosterone production.

Men with hypothyroidism often experience reductions in free testosterone.

Equally, low testosterone can sometimes influence thyroid hormone conversion and metabolism, creating a bidirectional relationship between the two systems.

Raised TSH, seen when the thyroid is struggling, also promotes the release of prolactin. This increase can influence testosterone levels, as well as impacting overall wellbeing by itself.

Cortisol

The thyroid and adrenal systems communicate constantly.

Chronic stress, poor sleep, inflammation, and elevated cortisol can influence thyroid hormone conversion and cellular thyroid signalling.

DHEA

DHEA is often referred to as a resilience hormone and serves as a precursor for several other hormones.

When stress levels are high and overall metabolic health is poor, DHEA levels can suffer alongside thyroid function.

This is one reason why looking at a single hormone in isolation rarely provides the full picture.

The hormones above are not a complete list either!

Lifestyle Factors That Affect Thyroid Health

The thyroid is heavily influenced by lifestyle factors.

No amount of medication or supplementation can fully compensate for:

• Chronic sleep deprivation
• Excess body fat
• Poor nutrition
• Chronic stress
• Inflammation
• Sedentary behaviour

The thyroid also relies on adequate nutritional support to function optimally.

Important nutrients include:

• Iodine
• Selenium
• Zinc
• Iron
• Vitamin D
• Vitamin A
• Magnesium

Deficiencies in these nutrients can impair thyroid hormone production, conversion, and function.

Why TSH Alone Doesn’t Tell the Full Story of Thyroid Health

One of the biggest mistakes I see is assuming that a normal TSH means thyroid function is optimal.

TSH is useful.

But it is only one piece of a much larger puzzle.

A comprehensive thyroid assessment should include:

• TSH
• Free T4
• Free T3
• Thyroid antibodies (TPOAb and TgAb)

Why is this important?

Because some people can have:

• Normal TSH
• Normal T4
• Elevated antibodies
  Poor conversion of T4 into active T3

TSH is often the first marker assessed, but evaluating Free T3, Free T4 and thyroid antibodies can provide a more complete picture of thyroid function.

And yet still experience significant symptoms.

Looking beyond TSH helps provide a more complete understanding of thyroid health.

Looking Beyond a Single Hormone

Hormones do not exist in separate compartments.

A man’s energy, mood, libido, body composition, recovery, and performance are influenced by a network of interconnected systems.

When symptoms develop, the goal shouldn’t be to chase a single number.

The goal should be to understand the bigger picture.

That means evaluating:

• Thyroid function
• Testosterone status
• Nutritional deficiencies
• Iron levels
• Stress and recovery
• Sleep quality
• Body composition
• Inflammation and metabolic health

Only then can we identify what is truly driving symptoms.

Should You Test Your Thyroid?

If you’re experiencing symptoms commonly associated with low testosterone, don’t assume testosterone is the only possible cause.

A comprehensive assessment can help determine whether your thyroid, testosterone, lifestyle factors, nutrient status, or a combination of several factors may be contributing.

Understanding the whole picture is often where the answers are found.

This Men’s health month don’t forget your hormones impact your health and psychology.

And there is more to your hormonal health than testosterone levels alone.

If you’re experiencing symptoms commonly associated with low testosterone, don’t assume testosterone is the only possible cause.

Assessing thyroid function, hormone status, nutrient levels and overall metabolic health can help identify what may be driving your symptoms.