Hypothyroidism: Symptoms and Diagnosis
An under-active thyroid quietly slows the whole body down. The symptoms are common and easy to put down to stress or age, which is why it is so often missed. Here is what to look for, and how a simple blood test confirms it.
What is hypothyroidism?
Hypothyroidism means the thyroid, the small gland in your neck, does not make enough thyroid hormone. Because that hormone sets the pace of your metabolism, everything slows down: energy, weight, mood, digestion and temperature.
The classic signs are tiredness, weight gain, feeling cold, dry skin and brain fog. They build slowly and look like ordinary life, so the condition is easy to miss. It cannot be diagnosed by symptoms alone: a blood test measuring TSH, Free T4, Free T3 and thyroid antibodies is what confirms it.
Symptoms of an under-active thyroid
Hypothyroidism rarely announces itself. The symptoms are wide-ranging and creep in over months, which is why people often live with them for a long time before testing.
Tiredness and weakness
Persistent fatigue that does not lift with rest is the most common complaint, often with muscle aches and heaviness.
Weight gain
Unexplained weight gain or difficulty losing weight, because a slow thyroid means a slow metabolism.
Feeling cold
Sensitivity to cold, cold hands and feet, when those around you are comfortable.
Brain fog and low mood
Poor concentration, forgetfulness, and low or flat mood are common and often mistaken for stress or depression.
Dry skin and hair
Dry, rough skin, brittle nails, and thinning hair, including the outer edge of the eyebrows.
Other signs
Constipation, a slow heartbeat, a hoarse voice, a puffy face, and in women, heavier or irregular periods.
Who is most at risk
Anyone can develop an under-active thyroid, but it is far more common in some groups. You are more likely to be affected if you:
- Are a woman, especially over 40. Thyroid problems are several times more common in women than men.
- Have a family history of thyroid or autoimmune conditions.
- Have another autoimmune condition, such as type 1 diabetes or coeliac disease.
- Have recently been pregnant, since the thyroid can become under-active in the months after birth.
The most common cause worldwide is an autoimmune condition called Hashimoto's, where the immune system gradually attacks the thyroid. A thyroid antibody test shows whether this is what is happening.
How hypothyroidism is diagnosed
Symptoms can point towards the thyroid, but they cannot confirm it, because they overlap with low iron, low vitamin B12, low vitamin D, perimenopause and depression. Diagnosis is made with a blood test, and a full picture needs more than one marker.
TSH, the first-line test
TSH is the signal from your brain telling the thyroid to work. A raised TSH is the earliest sign the thyroid is struggling, often before you feel very unwell.
Free T4 and Free T3
These are the actual thyroid hormones. They confirm whether levels are genuinely low and how far, which TSH alone cannot tell you.
Thyroid antibodies
Anti-TPO antibodies show whether the cause is autoimmune (Hashimoto's). This explains why it happened and what to expect.
The full picture
Because one marker can be normal while another is not, a panel that measures all of these together gives the clearest answer in one test.
Complete Thyroid Panel
R1,566 full thyroid blood panelOne blood test that covers everything needed to assess thyroid function, rather than a single TSH that can miss the fuller story. Walk in, no doctor referral, plain-language results.
- TSH, the first-line marker of thyroid function.
- Free T4 and Free T3, the active thyroid hormones.
- Anti-TPO and Anti-Thyroglobulin antibodies, to check for an autoimmune cause.
- Results in 2 to 5 working days, with a plain-language report.
Thyroid testing in South Africa
Thyroid problems are common and frequently undiagnosed, partly because the symptoms are so easily attributed to stress, diet or a busy life. Affordable testing without a referral makes it practical to check rather than wonder, whether you have medical aid or are paying cash.
Rule it in or out
If fatigue, weight gain or brain fog have lingered, a thyroid panel gives a clear answer instead of guesswork.
Check early
If thyroid or autoimmune conditions run in your family, testing catches changes sooner.
No referral, three cities
Walk in at Observatory in Cape Town, Hillcrest in Durban or Parktown North in Johannesburg.
Is hypothyroidism covered by medical aid?
Yes. Hypothyroidism is a chronic condition on South Africa's Prescribed Minimum Benefit list, so every registered medical scheme has to cover it, even on entry-level hospital plans, and even once your day-to-day benefits are used up.
Because it is a Prescribed Minimum Benefit on the Chronic Disease List, schemes must cover the diagnosis, the doctor's consultations, the monitoring tests and the medication for hypothyroidism. In practice that means the blood test to diagnose it, and the repeat tests to monitor it, are claimable, not just the treatment.
How to claim the testing
- You need a doctor's referral to claim. Cash patients need no doctor referral to test, but to claim through medical aid the test must be requested by a doctor.
- Register the condition with your scheme. Chronic cover is unlocked once your doctor confirms the diagnosis and you register it, using the ICD-10 code for hypothyroidism (E03). Without the code, tests can come off your day-to-day savings instead of the chronic benefit.
- We submit the claim for you, or invoice you to claim yourself, whichever you prefer. We will need your scheme and plan name, the referral, and the ICD-10 code.
One honest note: cover varies by scheme and plan, and we cannot confirm what yours pays, so check with your scheme or send us the details and we will check before you come in. Co-payments usually apply to medication if you step outside your scheme's approved list, not to the diagnostic test. If you would rather keep it private, you can simply pay the cash price of R1,566, with no doctor referral and nothing appearing on your medical aid statement.
For a step-by-step walk-through, see our guide on how to claim chronic benefits.
Hypothyroidism is one of the conditions people live with for far too long, because the symptoms are so easy to explain away. A simple blood test settles it. When the thyroid is the cause, knowing that early changes everything about how someone is looked after.
A note on results and treatment
Epicentre is a laboratory, so we test and report; we do not diagnose or prescribe. If your thyroid results are abnormal, they should be reviewed by a doctor, who can confirm the diagnosis and decide on treatment. We can connect you with a partner doctor to act on your results. Seek prompt medical care if you have a very slow heartbeat, severe swelling, or feel extremely unwell.
Hypothyroidism: quick answers
Thyroid testing in Cape Town, Durban and Johannesburg
The Complete Thyroid Panel is available at all three Epicentre walk-in labs. Walk in, or book online first. A nurse takes the blood sample, and results are emailed to you.
Thyroid testing in Observatory
24 Lower Main Road, Observatory, Cape Town, 7925
Serving City Bowl, Woodstock, Salt River, Mowbray, Rondebosch and the Southern Suburbs.
Get directions →Thyroid testing in Hillcrest
2 Knelsby Avenue, Hillcrest, Durban, 3610
Serving Kloof, Gillitts, Waterfall, Pinetown and the Upper Highway area.
Get directions →Thyroid testing in Parktown North
2 7th Avenue, Parktown North, Johannesburg, 2193
Serving Rosebank, Parkhurst, Craighall, Hyde Park, Sandton and Randburg.
Get directions →Related reading
Sources
- SEMDSA/ACE-SA Guideline for the Management of Hypothyroidism in Adults. S Afr Fam Pract. 2015;57(6):4-11.
- Ditshego R, et al. Advances in hypothyroidism management. S Afr Pharm J. 2025;92(4).
- Hypothyroidism. StatPearls, NCBI Bookshelf. 2023.
- Prescribed Minimum Benefits and the Chronic Disease List. Council for Medical Schemes.
Medically reviewed by Dr Samantha Naidoo, MB ChB, FCP (SA), Medical Director at Epicentre Walk-In Labs. Reviewed 18 June 2026. This article is general health information, not a medical diagnosis. Epicentre Aids Risk Management (Pty) Ltd provides diagnostic laboratory testing and does not provide diagnoses, treatment or prescriptions to the public; results are intended to inform discussions with a registered healthcare practitioner.
Find out if your thyroid is the cause
If the tiredness, weight gain or brain fog will not budge, a thyroid panel gives a clear answer in one test. Walk in at Observatory, Hillcrest or Parktown North, no doctor referral needed.
