Tired, cold and losing hair? When a thyroid test is worth doing
Thyroid problems are common in Indian women and easy to dismiss as stress. What the symptoms look like, which panel to book, and why the timing of your sample matters.
The thyroid is a small gland in the neck that sets the pace of your metabolism. When it runs slow or fast, the effects reach almost every system — which is precisely why the symptoms are so easily attributed to something else.
An underactive thyroid (hypothyroidism)
The more common pattern, and considerably more common in women:
- Tiredness that rest does not resolve
- Weight gain without a change in eating
- Feeling cold when others are comfortable
- Dry skin and noticeable hair fall
- Constipation
- Heavy or irregular periods
- Low mood and slowed thinking
- Puffiness around the eyes
An overactive thyroid (hyperthyroidism)
Less common, and often mistaken for anxiety:
- Weight loss despite a good appetite
- Racing or irregular heartbeat
- Feeling hot, sweating more than usual
- Tremor in the hands
- Difficulty sleeping, restlessness
- Loose motions
Which test to book
TSH alone is the standard screen. It is the most sensitive single indicator, because the pituitary raises TSH early — often before T3 and T4 have shifted.
A full thyroid profile (T3, T4, TSH) is more useful when you have symptoms rather than just screening, because it shows what the gland itself is doing.
Anti-TPO antibodies answer a different question: why. A positive result points to Hashimoto's thyroiditis, an autoimmune cause. That changes expectations — autoimmune thyroid disease usually needs lifelong monitoring, and it clusters with other autoimmune conditions.
Two things about timing
Give the sample before your morning dose if you already take thyroid medication. Taking the tablet first can raise the reading and make a stable dose look excessive.
Morning samples are preferable. TSH follows a daily rhythm, peaking overnight and falling through the day. An afternoon sample can sit meaningfully lower, which occasionally makes borderline hypothyroidism look normal.
Pregnancy is a special case
Thyroid requirements rise in pregnancy, and untreated hypothyroidism carries real risk for the baby's development. Reference ranges are different and tighter in pregnancy — an "acceptable" result in a non-pregnant adult may need treating. If you are pregnant or planning, tell us, and ask your doctor about the free thyroid profile, which is preferred because pregnancy alters the carrier proteins that the total profile measures.
After an abnormal result
Do not panic at a single borderline TSH. Mild elevations often settle, particularly after an illness. Doctors commonly repeat the test after six to eight weeks before starting treatment — unless symptoms are clear or antibodies are positive.
General information, not medical advice. Thyroid results need interpreting alongside your symptoms, medication and pregnancy status.
Tests mentioned in this guide
Common questions
Should I stop my thyroid tablet before the test?
No — do not stop your medication. Simply give the sample before you take that morning dose, then take it as usual afterwards.
Is fasting required for a thyroid test?
No. A morning sample is preferred because TSH varies through the day, but you do not need to fast.
What does a positive Anti-TPO mean?
It indicates an autoimmune cause, usually Hashimoto\u2019s thyroiditis. It explains why the thyroid is underactive and means the condition generally needs long-term monitoring.
Can stress cause an abnormal thyroid result?
Severe illness and stress can temporarily disturb thyroid readings. This is one reason doctors often repeat a borderline result after several weeks rather than treating immediately.