🩸 Blood & Iron Health

Thyroid Fatigue Indicator

Answer 12 questions about how you've been feeling. This screener checks for the most common symptoms of thyroid-related fatigue — the kind of exhaustion that sleep doesn't fix — and gives you a starting point for a conversation with your doctor.

How have you been feeling over the past month?
Rate each symptom honestly — there are no right or wrong answers.
0 of 12 answered 0%
⚡
Energy & Metabolism
1Do you feel tired or exhausted even after a full night's sleep?
2Do you feel unusually cold — cold hands, feet, or needing more layers than others around you?
3Have you gained weight despite no major changes to your diet or activity level?
4Do you experience constipation or noticeably sluggish digestion?
5Does your heart feel slow, or does your body feel generally sluggish — like everything is running at half speed?
6Is it unusually hard to get going in the morning — with low energy that drags on for hours after waking?
🧠
Body, Mind & Appearance
7Do you experience brain fog, difficulty concentrating, or unexpected memory lapses?
8Do you feel persistently low, emotionally flat, or unmotivated — even without a clear reason?
9Do you have dry skin, brittle nails, or hair that feels coarse or unusually dry?
10Have you noticed more hair falling out than usual, or your hair becoming noticeably thinner?
11Do you experience muscle weakness, general achiness, or stiffness in your joints?
12Do you notice puffiness or mild swelling around your face, eyes, or hands — especially in the morning?
Additional risk context (optional)
Do you have a family history of thyroid disease?
Do you have an autoimmune condition (e.g. Type 1 diabetes, lupus, celiac, rheumatoid arthritis)?
Have you given birth or experienced significant hormonal changes in the last 12 months?
0 /36

symptom score across 12 indicators

Low
0 – 7
Mild
8 – 16
Moderate
17 – 26
High
27 – 36
Domain A
Energy & Metabolism
— / 18
Domain B
Body, Mind & Appearance
— / 18

Symptoms most frequently reported:

What you can do right now:

    What is thyroid fatigue?

    The thyroid — a butterfly-shaped gland at the base of your neck — produces hormones that regulate every cell's energy production. When it's underactive (hypothyroidism), metabolism slows across the entire body: energy drops, temperature falls, digestion slows, and mood can sink. The fatigue is distinctive — deep, persistent, and unrelieved by sleep.

    Hypothyroidism affects roughly 5% of the population, and up to 10% over age 60. Women are 5–8× more likely to develop it than men. Many cases go undiagnosed for years because the symptoms are vague and overlap with depression, stress, and ageing.

    Classic signs of hypothyroidism

    Fatigue that sleep doesn't fix
    Feeling cold when others are comfortable
    Unexplained weight gain
    Brain fog and poor memory
    Hair loss or thinning
    Dry skin and brittle nails
    Depression or low mood
    Constipation
    Muscle weakness or aches
    Slow heart rate
    Puffiness around the face or eyes
    Heavy or irregular periods (women)

    You might also like

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    Iron Deficiency RiskAnother common fatigue cause
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    Burnout RiskEmotional vs. physical fatigue
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    Sleep NeedHow much sleep do you need?
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    Brain FatigueCognitive load & mental fog
    NOTE: This is a symptom screener, not a diagnostic tool. Thyroid dysfunction can only be confirmed with a blood test (TSH). Many conditions share these symptoms. This calculator is intended to help you start a conversation with your doctor — not replace one.