TSH Suppression Calculator: Weigh The Benefits And The Risks
A suppressed TSH protects some people and quietly costs others. Find out which side of that trade you're on:
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. The benefit side of the scale depends entirely on the why.
#2. Say How Low And Who You Are
Your TSH level, your age, your menopause status, and your heart and bone history. The risk side of the scale is personal, and these are the inputs that set it.
#3. Read The Trade
Both sides laid out honestly, a read on which way your balance leans, and the questions that turn it into a real conversation with your doctor.
Why TSH Suppression Is A Trade, Not A Setting
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. Withholding it is protection.[1]
But the protection is not free. 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]
Here’s the part that changes the math for most people: the trade is supposed to be re-negotiated. The guidelines relax TSH targets as your response to treatment is confirmed, and an excellent response usually earns you a target near low-normal.[1] Plenty of patients stay fully suppressed for years past that point because nobody reopened the conversation.
That’s the job of this calculator: figure out which side of the trade you’re on today, and hand you the questions that reopen it.
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. That’s exactly why this is a calculator and not a yes or no answer.
Ask your doctor this exact question, because the guidelines say the target can usually relax toward low-normal once an excellent response is confirmed. Many patients are still fully suppressed years later simply because nobody revisited it. This is the single most useful conversation this page can start.
No, and the difference matters. 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 the fix is a dose conversation, which is a much easier problem to have.
The two systems paying the cost: 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.