TSH 5.5 — Do You Have Hypothyroidism? Indian Guide to Thyroid Values

A TSH of 5.5 mIU/L is slightly above the upper normal limit (usually around 4.0–5.0 mIU/L depending on the lab). This puts you in a category called subclinical hypothyroidism — a mild thyroid under-function where TSH is elevated but free T4 is still normal.

• •You probably do not need thyroid medication immediately. Most Indian endocrinologists watch and retest before prescribing at this level.
• •Roughly 1 in 3 cases of TSH 4.5–10 return to normal spontaneously on a repeat test.
• •If you have symptoms (fatigue, weight gain, cold intolerance, hair fall, constipation, brain fog), treatment is more likely to help.
• •If you're pregnant or trying to conceive, the threshold for treatment is much lower — TSH above 2.5 is generally treated in pregnancy.
• •TSH is lab-sensitive — the same blood can read 5.2 in one lab and 5.8 in another. Trend matters more than a single value.

The rest of this guide explains exactly what TSH is, what subclinical hypothyroidism means for you, when to treat, and what to do next.

TSH stands for Thyroid Stimulating Hormone. Despite the name, it's not made by your thyroid — it's made by your pituitary gland (in your brain), and its job is to tell the thyroid how much thyroid hormone to produce.

Here's the clever bit: TSH works on a feedback loop.

• •If your thyroid is underactive (not making enough hormone), the pituitary senses the low hormone and pumps out more TSH to shout "make more!". So TSH goes UP in hypothyroidism.
• •If your thyroid is overactive (making too much hormone), the pituitary senses the high hormone and shuts down TSH production. So TSH goes DOWN in hyperthyroidism.

This is why TSH is the most sensitive marker of thyroid function — it picks up problems earlier than measuring thyroid hormones directly. Even a mild thyroid slowdown shows up as a rising TSH before free T4 visibly drops.

• •TSH — the most sensitive marker
• •Free T4 (FT4) — the main thyroid hormone
• •Free T3 (FT3) — the active form (less routinely useful)
• •Anti-TPO antibodies — detects autoimmune thyroid disease (Hashimoto's)

Cost in India: TSH alone ₹250–₹500. Full thyroid profile ₹600–₹1,200 at Thyrocare, Dr. Lal PathLabs, SRL, Metropolis, Apollo Diagnostics. No fasting required. Morning samples are slightly preferred as TSH has mild daily variation.

Different labs use slightly different cut-offs, but the current consensus from the Indian Thyroid Society and most lab guidelines:

Where your 5.5 sits:

Special populations where lower targets apply:

• •Pregnant women: TSH above 2.5 in the first trimester is generally treated (some guidelines say 4.0). Untreated hypothyroidism in pregnancy affects the baby's development.
• •Trying to conceive: TSH below 2.5 is recommended before and during conception for better fertility outcomes.
• •Over 70: Slightly higher TSH (up to 6.0–7.0) is often accepted as "normal for age" to avoid overtreatment in the elderly.

Important: Indian lab reference ranges vary. Always read the range printed on your own report. Your 5.5 might be "slightly high" at one lab (range 0.4–4.5) and "borderline" at another (range 0.3–5.5).

"Subclinical" = TSH is elevated but free T4 is still normal.

It means your pituitary has noticed the thyroid is lagging slightly and is compensating by making more TSH — but the thyroid is still, just barely, keeping free T4 in the normal range. You're on the verge, but not yet in overt thyroid failure.

What causes subclinical hypothyroidism in Indians?

1. 1.Hashimoto's thyroiditis (autoimmune) — the most common cause globally and in India. Your own immune system slowly attacks thyroid tissue. Detected by anti-TPO antibodies in the blood.
2. 2.Iodine imbalance — both deficiency and excess can cause thyroid dysfunction. Most of India is iodine-sufficient (iodised salt), but some regions still have issues.
3. 3.Thyroid surgery or radioactive iodine treatment — for previous thyroid problems
4. 4.Certain medications — lithium, amiodarone, interferon, some immunotherapy drugs
5. 5.Postpartum thyroiditis — inflammation after childbirth, common in Indian women
6. 6.Idiopathic — no identifiable cause; may normalise on its own

• •Women, especially after age 35
• •Family history of thyroid disease
• •Anti-TPO antibody positive
• •Other autoimmune conditions (type 1 diabetes, vitiligo, coeliac)
• •Postpartum period
• •Certain medications

• •~30% return to normal spontaneously on retest
• •~50% remain stable for years
• •~20% progress to overt hypothyroidism, usually slowly

Anti-TPO positive patients are much more likely to progress. This is why the antibody test matters.

The tricky part about mild hypothyroidism is that the symptoms are non-specific — they overlap with stress, poor sleep, anaemia, vitamin D deficiency, iron deficiency, depression, and simply being overworked. Many people with TSH 5.5 feel fine. Many with TSH 5.5 feel terrible. The number alone doesn't predict symptoms.

Classic hypothyroid symptoms to check honestly:

• •Fatigue — all-day tiredness, poor stamina, waking unrefreshed
• •Unexplained weight gain or difficulty losing weight
• •Cold intolerance — always feeling cold, cold hands and feet
• •Hair loss or thinning — especially outer edges of eyebrows (classic sign)
• •Dry skin and brittle nails
• •Constipation
• •Brain fog — poor concentration, forgetfulness, slow thinking
• •Depression or low mood
• •Muscle aches and joint stiffness
• •Menstrual irregularities — heavy periods, longer cycles
• •Infertility or miscarriages
• •Hoarse voice (in more advanced cases)
• •Puffy face and eyelids

• •Multiple symptoms present together
• •Symptoms worsening over time
• •Anti-TPO antibodies positive
• •Trying to conceive or pregnant
• •Cholesterol rising alongside the TSH (the thyroid affects lipid metabolism)

• •Weight gain without any other symptom and a stable TSH over time is usually not thyroid-driven
• •Fatigue without cold intolerance or hair changes is more likely iron, vitamin D, sleep, or mental health

The honest question: if you feel fine, TSH is 5.5, and you have no other red flags, watching and waiting for 6–12 weeks is reasonable. If you feel unwell and have multiple symptoms, a trial of levothyroxine may be worth discussing with your doctor.

Step 1: Get the full thyroid picture.

• •Free T4 (FT4)
• •Free T3 (FT3)
• •Anti-TPO antibodies

Anti-TPO is especially important — a positive result means autoimmune thyroiditis, which changes the management and the likelihood of progression.

Step 2: Repeat TSH after 6–12 weeks.

A single TSH reading is a snapshot. Stress, recent illness, sleep deprivation, and the time of day can all nudge TSH up or down by 0.5–1.0 mIU/L. A second reading tells you whether 5.5 is a true baseline or a temporary blip.

Step 3: Check your iron, vitamin D, and B12.

These four (thyroid, iron, vitamin D, B12) are the "fatigue quartet" — and deficiencies in one make the others feel worse. Correcting iron and vitamin D sometimes improves "thyroid symptoms" dramatically even without treating the thyroid.

Step 4: Decide on treatment with your doctor.

The standard treatment for clinically significant hypothyroidism is levothyroxine (brands: Thyronorm, Eltroxin, Thyrofit, Thyrox — all are chemically the same). For subclinical hypothyroidism at TSH 5.5, treatment is optional and case-by-case:

• •Symptomatic → low-dose levothyroxine trial (25–50 mcg/day), retest in 6–8 weeks
• •Asymptomatic + anti-TPO positive → may start low-dose treatment or watch closely
• •Asymptomatic + anti-TPO negative → usually watch and retest in 3–6 months
• •Pregnant or planning pregnancy → treat
• •TSH above 10 on retest → treat regardless of symptoms

Step 5: Retest thyroid every 6–12 months minimum, even if you decide not to treat. Subclinical hypothyroidism can progress silently.

A single TSH is nearly meaningless without context. The same value — 5.5 — means completely different things depending on your trajectory.

• •TSH two years ago: 2.1
• •TSH one year ago: 3.8
• •TSH today: 5.5

• •TSH two years ago: 8.9
• •TSH one year ago: 7.0
• •TSH today: 5.5

Person A is developing hypothyroidism — their TSH has more than doubled in two years and is still rising. Treatment or close monitoring is warranted. Person B is recovering — whatever is causing their thyroid stress (postpartum, medication, stress) is resolving, and watchful waiting is right.

You cannot tell these two stories apart from today's number alone. You need the trend — and that means keeping every thyroid report you've ever had, in one place, readable across years.

Arogya Story automatically reads lab reports from any Indian lab and extracts every value — including TSH, FT4, FT3, and anti-TPO. Upload your past reports and you'll immediately see:

• •Your full TSH trend over years
• •How your thyroid values correlate with weight, energy, and mood-related markers
• •Flagged abnormal values with reference ranges
• •Family members (mothers, sisters) in one account — thyroid disease runs in families
• •Reminders when it's time to retest

No signup needed to try. Upload one thyroid report and see it in action.