How Your Thyroid Affects Your Heart Rate and Rhythm
Most people think of the thyroid as a gland that controls body weight or energy levels. But according to Dr. Nikhila Pachani, Consultant Interventional Cardiologist at Backbone Medicity Hospital, Rajkot, the thyroid does much more than that — it directly controls your heart rate and rhythm too.
What Does the Thyroid Have to Do with the Heart?
Your thyroid gland sits in your neck and produces hormones that regulate your body's metabolism — that is, how fast or slow your body works. Since the heart is part of that system, thyroid problems can quickly show up as heart problems.
When the Thyroid Is Overactive (Hyperthyroidism)
If your thyroid produces too many hormones, your body goes into overdrive. This can cause:
- A rapid heartbeat (feeling like your heart is racing)
- An irregular heart rhythm (also called arrhythmia)
- In serious cases, even heart failure
This happens because excess thyroid hormones push the heart to work faster than it safely should.
When the Thyroid Is Underactive (Hypothyroidism)
If your thyroid produces too few hormones, the body slows down. For the heart, this can mean:
- A slower than normal heart rate
- A rise in cholesterol levels, which increases the risk of blocked arteries and heart disease
Over time, untreated hypothyroidism can quietly raise your risk of a heart attack or other cardiac events.
Warning Signs to Watch For
Dr. Pachani advises people to pay attention to these symptoms and get checked promptly:
- Palpitations — a fluttering or racing feeling in the chest
- Unusual fatigue — feeling tired even without much activity
- Swelling in the legs or face
If you notice any of these signs, it is important to check both your heart and your thyroid — not just one or the other.
A Simple Blood Test Can Make a Big Difference
The good news is that thyroid problems are easy to screen for. A simple blood test measuring your thyroid hormone levels (TSH, T3, T4) can reveal whether your thyroid is working normally. Catching a thyroid imbalance early can help protect your heart before any serious damage occurs.
If you are experiencing palpitations, fatigue, or any heart-related symptoms, consider consulting a qualified cardiologist for a proper evaluation and personalised guidance.