TSH Suppression Calculator: Weigh The Benefits And The Risks
A suppressed TSH protects some patients but causes problems for others. See how the benefits and risks apply to you:
Written and medically reviewed by Dr. Westin Childs, D.O. Last reviewed: August 28, 2026
How To Use This Calculator:
#1. Say Why Your TSH Is Low
Suppression after thyroid cancer, a dose that overshot, or a deliberate choice. How much you benefit depends entirely on why it’s low.
#2. Say How Low And Who You Are
Your TSH level, your age, your menopause status, and your heart and bone history. Your risks depend on these answers.
#3. Compare Your Benefits and Risks
You’ll see the benefits and risks of keeping your TSH suppressed, which matter most in your situation, and questions to discuss with your doctor.
When TSH Suppression Helps and When It Causes Problems
After thyroid cancer, keeping TSH suppressed has a real purpose: TSH is a growth signal for thyroid cells, including any cancer cells that survived treatment. Keeping it low protects you.[1]
But a suppressed TSH does come with some risks. In the Framingham data, people over 60 with a TSH at or under 0.1 developed atrial fibrillation at about 3 times the rate of those with normal TSH over ten years.[2] And after menopause, a suppressed TSH accelerates bone loss and raises fracture risk.[3]
Your TSH target should be reviewed as your response to treatment changes. The guidelines relax TSH targets as your response to treatment is confirmed, and an excellent response usually means a target near low-normal.[1] If your response is excellent and you’re still fully suppressed, ask your doctor whether your target should relax.
Use this calculator to see whether the benefits still outweigh the risks for you, then take the questions to your doctor.
Frequently Asked Questions
It depends on who you are and how low it is. Under 60 with strong bones, the measurable risks are modest. Over 60, fully suppressed, or after menopause, the atrial fibrillation and bone numbers are real.
Ask your doctor this exact question, because the guidelines say the target can usually relax toward low-normal once an excellent response is confirmed.
No. Intentional suppression is a trade with a benefit on the other side. An accidentally low TSH from your dose is the same risk with no benefit attached, and adjusting your dose with your doctor is a more straightforward fix.
Your heart rhythm and your bones. That usually means your doctor watching for palpitations and rhythm changes, and bone density scans on a schedule if you’re past menopause. If nobody has mentioned either, bring the printout from this page.
Related Tools
- Recurrence Risk Calculator: the tier that sets your suppression target
- Response to Therapy Calculator: the category that lets it relax
- All Thyroid Calculators & Quizzes: the full set of free tools
Scientific References
- Haugen BR, Alexander EK, Bible KC, et al. 2015 American Thyroid Association Management Guidelines for Adult Patients with Thyroid Nodules and Differentiated Thyroid Cancer. Thyroid. 2016;26(1):1-133.
- Sawin CT, Geller A, Wolf PA, et al. Low serum thyrotropin concentrations as a risk factor for atrial fibrillation in older persons. N Engl J Med. 1994;331(19):1249-1252.
- Bauer DC, Ettinger B, Nevitt MC, Stone KL. Risk for fracture in women with low serum levels of thyroid-stimulating hormone. Ann Intern Med. 2001;134(7):561-568.
