The Thyroid Conversation Every Woman Needs To Have (Including a Doctor’s Questions Checklist)

By Alexandra Cortina

We talk a great deal about hormones in relation to stress, sleep, fertility, weight and menopause, yet one of the most important hormonal players in the body is still surprisingly overlooked: the thyroid. This small butterfly shaped gland sits at the front of the neck, but its influence reaches almost every cell in the body. Thyroid hormones help regulate energy, metabolism, temperature, digestion, mood, cognition, cholesterol, heart rhythm and menstrual health. In simple terms, the thyroid helps set the pace at which the body runs.

When the thyroid is underactive, everything can feel slowed down. When it is overactive, the body can feel as though it is running too fast. Both states can be deeply disruptive, and both can easily be mistaken for something else.

Why women need to pay attention

For women, thyroid health deserves particular attention. Hashimoto’s thyroiditis, an autoimmune condition in which the immune system targets the thyroid, is four to ten times more common in women than men and more often develops between the ages of 30 and 50. It is also more likely where there is family history or another autoimmune condition. [1]

This is exactly the stage of life when symptoms can be dismissed as stress, ageing, motherhood, burnout or perimenopause. Fatigue, brain fog, low mood, constipation, feeling cold, hair shedding, weight gain, heavy periods, dry skin, anxiety, poor sleep and rising cholesterol can all have many causes. But the thyroid should be part of the conversation.

Symptoms matter, but testing matters too. Standard thyroid assessment often starts with TSH and free T4, while free T3 and thyroid antibodies may be helpful in selected cases. Thyroid peroxidase antibodies and thyroglobulin antibodies can help identify autoimmune thyroid patterns such as Hashimoto’s. [2]

Can we protect the thyroid before things go wrong?

We cannot guarantee prevention of Hashimoto’s or hypothyroidism. Autoimmune disease is shaped by genetics, hormones, immune activity, environmental exposures and life stage. But we can support thyroid resilience, reduce avoidable stressors, correct nutrient gaps and test earlier.

A good preventative approach starts with knowing your baseline, especially if there is family history, another autoimmune condition, fertility issues, recurrent miscarriage, unexplained fatigue, rising cholesterol or symptoms that persist despite doing everything right.

I would think of prevention less as trying to stimulate the thyroid, and more as creating the conditions in which thyroid hormones can be produced, converted, absorbed and used well.

Prevention is not about pushing the thyroid harder. It is about creating the conditions in which thyroid hormones can be made, converted, absorbed and used well.

The nutrients your thyroid needs

The thyroid does not need extreme diets or aggressive thyroid boosting supplements. It needs the right nutrients, in the right amounts, within a well nourished body.

Iodine is required to make thyroid hormones, but more is not better. High dose iodine, kelp and sea moss can be problematic in susceptible people, particularly those with autoimmune thyroid tendencies. The British Thyroid Foundation advises avoiding kelp and sea moss because they may interfere with thyroid function and wellbeing. [3,4]

Selenium is another key thyroid nutrient. It supports thyroid hormone metabolism and antioxidant protection within the gland. The adult recommended intake is 55 mcg daily, while the upper limit is 400 mcg daily. A 2024 systematic review found that selenium supplementation was associated with reductions in TSH and thyroid peroxidase antibodies in Hashimoto’s, although this does not mean everyone should supplement without testing or guidance. [5,6]

Iron, zinc, vitamin D, B12, folate, magnesium, omega 3 fats and adequate protein may also matter depending on the individual. Low ferritin, B12 and vitamin D can mimic or worsen thyroid type symptoms, including fatigue, low mood, poor concentration, hair shedding and weakness.

A thyroid supportive plate is simple: protein at each meal, colourful plants, fibre, healthy fats, mineral rich foods such as eggs, fish, seafood, yoghurt, pumpkin seeds, lentils, nuts and seeds, are all thyroid happy foods. 

Stress is thyroid care

A healthy thyroid does not only need nutrients. It needs the body to feel safe enough to regulate.

The thyroid sits within a wider endocrine network involving the brain, pituitary gland, adrenals, liver, gut, immune system and nervous system. Chronic stress may affect sleep, blood sugar, inflammation, immune regulation and thyroid hormone conversion.

This does not mean stress causes Hashimoto’s in a simplistic way. But stress can shape the terrain in which autoimmune and endocrine issues develop. One randomised controlled trial in women with Hashimoto’s found that an eight week stress management programme improved perceived stress and had beneficial effects on thyroid antibodies. [7]

For women in midlife, stress support is not a luxury. It is metabolic care. Morning light, regular meals, strength training without overtraining, walking, breathwork, therapy, yoga, sleep rhythm and genuine recovery all form part of a thyroid supportive lifestyle.

A healthy thyroid does not only need nutrients. It needs the body to regulate.

If you do have a thyroid issue

If hypothyroidism is diagnosed, the standard first line treatment is usually levothyroxine, a synthetic form of T4. For many people, it works well and can be life changing. NICE guidance recommends levothyroxine as the usual treatment for primary hypothyroidism, with dose and monitoring adjusted according to the individual. [8]

But levothyroxine is not the whole thyroid conversation. It provides T4, which the body then has to convert into T3, the more biologically active thyroid hormone. T3 is involved in energy production, cognition, mood, temperature regulation, cholesterol metabolism and cellular function.

This is where the conversation becomes more nuanced. Some people on levothyroxine have normal TSH but still do not feel well. Their blood tests may look acceptable, yet they continue to experience fatigue, brain fog, low mood, weight changes, poor temperature regulation or raised cholesterol.

Why symptoms can persist

Persistent symptoms do not automatically mean someone needs a different medication. There are several things to review first. Is the dose right? Is the medication being absorbed properly? Is it being taken away from coffee, calcium, iron, antacids or other interfering supplements? The NHS advises taking levothyroxine at least 30 minutes before breakfast or caffeinated drinks because food and caffeine can reduce absorption. [9]

It is also worth looking at ferritin, B12, vitamin D, sleep, stress, blood sugar, perimenopause, gut health and other autoimmune conditions. Sometimes the thyroid is only part of the picture.

But there is also a bigger question: does a normal TSH always mean thyroid hormone signalling has been fully restored across the body? A systematic review and meta analysis by McAninch and Bianco found that levothyroxine treated patients with normal TSH still had higher LDL cholesterol and total cholesterol compared with healthy controls, suggesting that some biological markers of thyroid hormone signalling may not be fully normalised in all patients. [10]

The thyroid and your heart

This is one of the most important points to understand. The thyroid is not just about energy or weight. It is also deeply connected to cardiovascular health. Thyroid hormones help regulate heart rate, blood vessel function and cholesterol metabolism. When thyroid hormone signalling is low, LDL cholesterol may rise because the liver becomes less efficient at clearing cholesterol from the blood.

The NHS notes that untreated hypothyroidism, or being on the wrong dose of medicine, can increase the risk of heart problems including coronary heart disease and heart failure. [11] This is why an unexpected rise in cholesterol, especially LDL cholesterol, should prompt a thyroid conversation. It does not mean the thyroid is always the cause, but it should be ruled in or out.

What about T3 and natural desiccated thyroid?

This is where patient interest is growing. Levothyroxine gives T4 only. Combination therapy gives T4 plus T3. Natural desiccated thyroid, often called NDT, contains both T4 and T3 because it is derived from animal thyroid gland, usually porcine.

In my view, T3 and natural desiccated thyroid deserve a more serious and nuanced place in the conversation, particularly for selected patients who remain symptomatic on T4 only therapy. Natural desiccated thyroid (NDT) may feel more physiologically complete to some patients because it contains both hormones rather than relying entirely on conversion from T4 to T3.

Armour Thyroid (a brand of NDT), for example, provides 38 mcg of T4 and 9 mcg of T3 per grain, a ratio of just over 4:1. [12] This does not mean NDT or T3 therapy is right for everyone, and it should never be self prescribed. T3 is more biologically active and faster acting than T4, so dose, timing and monitoring matter.

Current UK guidance does not routinely recommend T3 or natural desiccated thyroid (NDT) extract because evidence of benefit over levothyroxine has been considered insufficient. [8] But the patient experience matters. If someone remains symptomatic despite normal tests, it is reasonable to ask better questions, review the whole picture and, where appropriate, seek specialist input from a doctor open to discussing T3 or NDT containing therapy.

Questions to ask your doctor

If you have symptoms, family history, positive antibodies, rising cholesterol or you are already on medication but still do not feel well, take a more complete list of questions to your GP or endocrinologist:

Can we check TSH, free T4, free T3 and thyroid antibodies? Could Hashimoto’s be involved? Could my cholesterol be connected to thyroid function? Am I taking my medication in the best way for absorption? Should we check ferritin, B12, folate, vitamin D and glucose markers? Could perimenopause, stress, sleep, gut health or another autoimmune condition be contributing? If my TSH is normal but I still feel symptomatic, would specialist review be appropriate? Is there any role for T3 or NDT containing therapy in my case?

The bottom line…

The thyroid may be small, but it is not peripheral. It sits at the crossroads of energy, mood, metabolism, immunity, fertility, cognition and cardiovascular health. For women in their thirties, forties and beyond, thyroid health deserves a place in the wellness conversation alongside stress, sleep, gut health, perimenopause and metabolic health.

Prevention is not about pushing the thyroid harder. It is about creating the conditions where your thyroid can thrive: enough nutrients, stable blood sugar, good sleep, lower stress, early testing and a medical conversation that does not dismiss symptoms simply because one marker appears normal.

Thyroid resilience checklist

• Know your family history and test earlier if symptoms persist.

• Ask about thyroid antibodies, not only TSH.

• Avoid high dose iodine, kelp and sea moss unless medically advised.

• Optimise selenium carefully. Food first where possible, supplement only when appropriate.

• Check ferritin, B12, vitamin D and lipids.

• Eat enough protein and avoid chronic restriction.

• Stabilise blood sugar with protein, fibre and healthy fats.

• Lower the stress load with sleep, recovery, movement, breathwork and nervous system support.

• If symptoms persist on medication, ask whether absorption, nutrients, menopause, cholesterol and T3 conversion have been reviewed.

References for fact checking are available on the Hip and Healthy website.