Feeling exhausted for no reason, or conversely, nervous with a racing heart? These symptoms could indicate Thyroid problem. In Quebec, thyroid disorders affect hundreds of thousands of people, and many live with them for years without knowing it.
The thyroid gland: its role in the body
The thyroid gland produces hormones T3 (triiodothyronine) and T4 (thyroxine) which regulate metabolism. The TSH (Thyroid-Stimulating Hormone) Thyroid control: TSH increases if the thyroid is too slow, TSH decreases if it's too fast.
Symptoms
- Persistent fatigue
- Abnormal chill
- Weight gain
- Constipation
- Dry skin, hair loss
- Depressed mood, difficulty concentrating
- Slow heartbeat
Main cause
Visit Hashimoto's thyroiditis (autoimmune disease). Blood test: High TSH, Low free T4.
To go further: Fact Sheet — Hypothyroidism
Hyperthyroidism: When the Thyroid Goes into Overdrive
Symptoms
- Rapid weight loss despite a good appetite
- Heart palpitations
- Nervousness, anxiety
- Hand tremors
- Heat intolerance
- Diarrhea
- Insomnia
Main cause
Visit Graves' disease. Blood draw Low TSH, T3 and T4 elevated.
To go further: Fact Sheet — Hyperthyroidism
Hypothyroidism vs. Hyperthyroidism: A Comparison Table
| Characteristic | Hypothyroidism | Hyperthyroidism |
|---|---|---|
| Metabolism | Slow down | Accelerated |
| Weight | Weight gain | Weight loss |
| Energy | Chronic fatigue | Agitation, nervousness |
| Heart | Bradycardia | Tachycardia, palpitations |
| Temperature | Chills | Heat intolerance |
| Transit | Constipation | Diarrhea |
| Mood | Depression | Anxiety, irritability |
| Skin/hair | Dry skin, hair loss | Moist skin, brittle hair |
| TSH | Raised | Low |
| T3/T4 | Basses | Raised |
| Main cause | Hashimoto | Basedow's (Graves') disease |
| Treatment | Levothyroxine (Synthroid) | Antithyroid drugs, radioactive iodine |
Diagnostics: TSH, T3, and T4
TSH reference values 0.4 to 4.0 mIU/L in adults. High TSH = hypothyroidism. Low TSH = hyperthyroidism. Possible further tests: thyroid antibodies, ultrasound, scintigraphy.
Treatments
Hypothyroidism
Levothyroxine (Synthroid) – Replacement hormone, lifelong use, well tolerated.
Hyperthyroidism
- Antithyroid medications (methimazole)
- Radioactive iodine
- Beta-blockers (symptoms)
- Surgery (thyroidectomy)
When to consult
- Persistent unexplained fatigue
- Weight gain or loss without lifestyle changes
- Palpitations or irregular heartbeat
- Unusual chilly or heat intolerance
- Significant mood swings
- Notable hair loss
- Neck enlargement
- Difficulty conceiving
A thyroid panel begins with a simple blood test. Our doctors at our service points in Quebec can assess your thyroid function—in person or via teleconsultation. RAMQ consultations and private services are available.
Omicron Clinic
Need to consult a doctor?
Treatment within 24-48 hours. In-clinic or telemedicine, anywhere in Quebec.
Insurance receipts. 7j/7. No family doctor required.
