Thyroid 101: What Your Body Is Trying to Tell You

Fatigue that doesn't improve with sleep. Hair that's thinning. Weight that changes even though nothing about your diet or exercise has changed. Feeling cold when everyone else in the room is comfortable. These are some of the most common complaints an ND hears, and they're also some of the most commonly dismissed, often because one lab number, TSH, came back "normal." Understanding what the thyroid actually does, and what standard testing tends to miss, is often the first step toward getting real answers.

What the Thyroid Actually Does

The thyroid is a small, butterfly shaped gland at the base of your neck, but its effects reach far beyond its size. It makes hormones that control your metabolism, body temperature, heart rate, digestion, mood, and even how your hair and skin renew themselves. Most of what the thyroid makes is T4, a hormone that isn't very active on its own. Your body has to convert T4 into T3, the active form your cells actually use, and most of that conversion doesn't happen in the thyroid itself. It happens in other tissues, including the gut and liver.

This matters because someone can have a thyroid that's making plenty of T4, and still feel hypothyroid symptoms, because that conversion step isn't working well.

Why "Normal" Labs Don't Always Tell the Full Story

Standard thyroid testing usually checks one thing: TSH, or thyroid stimulating hormone, a signal sent from the pituitary gland telling the thyroid to make more hormone. TSH is a decent starting point, but it's an indirect measurement, and the "normal" range is often wide enough to miss real problems.

A fuller picture usually includes free T4 and free T3, the actual hormone levels your body has available to use, plus reverse T3, which shows whether your body is converting T4 into an inactive form instead of the active one. Thyroid antibodies are also often left off standard panels, even though they're essential for catching autoimmune thyroid issues.

Signs Your Thyroid May Need a Closer Look

Thyroid symptoms usually build slowly and show up in more than one part of the body, which is why they're easy to blame on something else. Common signs include:

• Fatigue that doesn't go away even with enough sleep

• Weight gain you can't explain, or trouble losing weight

• Hair thinning, including losing the outer third of your eyebrows

• Feeling cold when other people feel fine

• Constipation or sluggish digestion

• Brain fog or trouble concentrating

• Low mood or more anxiety than usual

• Dry skin and brittle nails

• Irregular periods

Having one of these on its own doesn't necessarily mean something's wrong. But having several together, especially alongside labs that look "normal," is often a sign to look closer.

The Autoimmune Connection

Hashimoto's thyroiditis is the most common cause of an underactive thyroid. It's an autoimmune condition, meaning the immune system slowly attacks the thyroid itself. Because standard testing usually stops at TSH, Hashimoto's can go undiagnosed for years while symptoms keep building. The only way to catch it is to test thyroid antibodies specifically, thyroid peroxidase antibodies and thyroglobulin antibodies. Catching it early matters, because treating an autoimmune condition looks different from just supporting hormone levels.

Small, Sustainable Supports

Thyroid health is connected to the rest of the body, not separate from it. Selenium and zinc both help the body convert thyroid hormone into its active form. Good food sources of selenium include Brazil nuts, eggs, sardines, and sunflower seeds. Good food sources of zinc include pumpkin seeds, chickpeas, cashews, and lean beef.

Eating very large amounts of raw cruciferous vegetables, like broccoli, cauliflower, and cabbage, can make it harder for the thyroid to absorb iodine in some people. Cooking these vegetables removes most of that effect, so cooked versions are generally fine and still healthy to eat.

Ongoing stress and poor sleep also affect the thyroid, because they wear down the adrenal glands, which work closely with the thyroid. And gut health matters too: a large part of the process that turns thyroid hormone into its active form happens in the digestive tract. Because of these connections, supporting digestion, managing stress, and getting consistent sleep all help the thyroid, even before any other treatment is added.

You Do Not Have to Figure This Out Alone

Thyroid dysfunction is frequently missed, minimized, or only partially evaluated, which leaves people living with symptoms that have a real, treatable cause. Dr. Kizzy Raphael specializes in thyroid disorders, digestive issues, adrenal fatigue, and bioidentical hormone therapy, and uses comprehensive thyroid testing to see the full picture rather than a single number.

Schedule your complimentary 15-minute consultation to talk through what your body might be telling you.