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Is Thyroid Disease a Risk for your Heart?

thyroid disease

The relationship between thyroid health and cardiac health has been known since 18831. In mainstream medicine, it is typical to treat each organ system as its own entity hence the creation of a specialist in an “ology” practice.

Yet, the body is a whole. This is especially true with thyroid and cardiac health. A patient could typically see an endocrinologist only to be referred to a cardiologist.

If you have thyroid disease, you should know there are risks with either having an overactive or underactive thyroid gland. It is more often seen with hyperthyroidism and/or Graves’ disease. But, it can reveal itself in patients with Hashimoto’s thyroiditis.

Studies suggest that too much thyroid hormones can lead to high blood pressure and clotting problems. On the other hand too little can instigate high cholesterol and inflammation1.

thyroid disease

Risks for Underactive Thyroid and Heart Disease

In a recent meta-analysis of over 55 cohort studies, with approximately 2 million people involved, patients that had hypothyroidism compared to euthyroidism (normal thyroid function) had higher risks of ischemic heart disease and cardiac mortality4.

Key Insight: Low thyroid hormone levels can slow your heart down. They can then cause the arteries to become less elastic leading to high blood pressure.

Thyroid hormones help the liver break down lipids and reduce the number of triglycerides (fat in the blood). Thyroid hormones also assist in cellular metabolism. If there is a reduction in the amount of circulating thyroid hormones, this will slow down metabolism.

This can occur for a number of reasons, including:

  • Hashimoto’s thyroiditis
  • Surgery
  • Trauma to the thyroid gland

Some case-controlled studies have demonstrated that having TSH levels > 4, the higher the chances of coronary heart disease seen2.

The Thyroid Reset Program - Dr. Alan Christianson

If you are low in thyroid hormones, you can have elevated cholesterol levels, especially the low-density one called LDL. In addition, higher TSH levels are typically present in obese patients.

Risks for Overactive Thyroid and Heart Disease

Too much thyroid hormones such as T4 and T3 can cause heart palpitations and predispose you to a heart condition known as Atrial Fibrillation (A-Fib).

This leads to overstimulation of thyroid hormones on the heart. Ultimately, this causes it to beat irregularly.

Best Screening Methods for Thyroid and Heart Health

Let’s break down the steps of screening the health of both your thyroid and your heart. Please consider the following:

  1. Take the Thyroid Quiz (Click Here)
  2. Get your thyroid levels checked (TSH, fT3, fT3, TPO antibody, and TGB antibody)
  3. Get your cholesterol levels checked ( Lipids, Cardio IQ for a more in-depth lipid analysis)
  4. Screen your Lipoprotein A Levels. If it is high, your cholesterol needs to be lower than it would otherwise
  5. Get your glucose levels checked (Fasting glucose, HA1c)
  6. Thyroid ultrasound (Can help you identify if you have inflammation, nodules or early signs of thyroid disease)
  7. Cardiac CT score (A simple and fast way that can help you determine the number of calcium deposits in coronary arteries. Identify plaque build up in your arteries)

Key Insight: Most insurance companies do not pay but you can get a doctor’s order for cash price at a local imaging center.

Lifestyle Solutions

Outside of screening and treating, what are some simple solutions that you can put into action to benefit your heart and your thyroid?

Here is what you can try…


Cruciferous veggies, such as:

  • Broccoli
  • Kale
  • Cauliflower
  • Cabbage
  • Brussel Sprouts

These are often thought to be harmful to patients with thyroid disease. However, in their cooked forms, they are helpful for detoxing

This is imperative to the digestive system of those suffering from autoimmune conditions (Read: The complete guide to testing your body for toxins).


Sometimes, a single nutrient can be a limiting factor that prevents the ability to make proper thyroid hormones. Selenium is a good example of this (7 Rare nutrients your thyroid needs to survive).

This mineral is essential to help convert thyroid hormones to active hormones. An easy way to get the recommended amount of 200 mcg per day is to eat 3 brazil nuts every day.


Your thyroid needs iodine to function and needs it to make thyroid hormone (Read: How much iodine do you need for thyroid disease). However, too much or too little iodine can be problematic.

In the Western world, iodine deficiency is less likely. Individuals do not need to supplement much more of this mineral to support their thyroid health.

That said, some multivitamins and other supplements contain high levels of iodine. This can, cause more disruption and dysfunction of thyroid production.

The Institute of Medicine and WHO (World Health Organization) recommendations for iodine are 150mcg daily5.

Bottom Line: The thyroid gland only needs 52mcg daily to produce T4 and this is usually achieved by the amount of iodine present in thyroid medication.


The best exercises for both an underactive thyroid and cardiovascular health is low impact aerobics (Read: What is the best exercise).

What may have more of an impact is if you can do your exercises earlier in the day versus later in the evening.

This is due to changes in cortisol levels (a stress hormone). Together, this can affect your sleep due to strenuous evening activity.3

Secure Your Future Health Today

First, you need to seek out a practitioner that will help you figure out health concerns with an integrative approach. This is because the body systems are all related.

If you have abnormal lipid or glucose levels on your next physical examination, check for a potential underlying thyroid condition. Also, another big recommendation is that all men and women above 40 years old should have a baseline cardiac workup done.

It is interesting how many of us will get a maintenance check on our cars, yet when asked about maintaining our health, no one goes to a cardiologist for screenings.

You can easily live without a car, but not your heart! Please do what you can to secure your future health today, and reach out to the professionals at Integrative Health to learn more.

1. Cappola, A. R. & Ladenson, P. W. Hypothyroidism, and Atherosclerosis. J. Clin. Endocrinol. Metab. 88, 2438–2444 (2003).
2. Mya, M. M. & Aronow, W. S. Subclinical Hypothyroidism Is Associated With Coronary Artery Disease in Older Persons. Journal of Gerontology 57, (2002).
3. Yun Seo, D. et al. Morning and evening exercise. Integr. Med. Res. 2, 139–144 (2013).
4. Ning et al. BMC Medicine (2017) 15:21 DOI 10.1186/s12916-017-0777-9

Written by Dr. Linda Khoshaba of Integrative Health. Dr. Linda Khoshaba has been practicing as an Associate Physician at Integrative health for 5 years. She specializes in treating Hashimoto’s and Graves thyroid disease, Adrenal Dysfunction and Hormone imbalance in both men and women.

Learn more about Dr. Khoshaba here.