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PubMed This is a summary of 20 peer-reviewed journal articles Updated
Pathology

What to Expect From Thyroid FNA for Multinodular Goiter?

At a Glance

Thyroid FNA for multinodular goiter is usually a brief, ultrasound-guided outpatient biopsy with mild discomfort. Tell the biopsy team about blood thinners, follow their individualized medication plan, and seek emergency care for rapid neck swelling or breathing or swallowing problems.

In this answer

5 sections

01

Medication Planning and Blood Thinners

02

What to Expect During the Biopsy

03

Results and Next Steps

04

Aftercare and Recovery

05

When to Seek Urgent Medical Care

A thyroid fine-needle aspiration (FNA) is a brief outpatient procedure where a doctor uses ultrasound to guide a thin needle into one or more thyroid nodules (lumps in your thyroid gland) to collect cells for analysis [1]. You generally do not need to fast for this procedure, though you should always follow your clinic’s specific instructions. Most patients experience only mild discomfort or a brief pinching sensation [2]. While minor bruising or soreness is common afterward, serious bleeding is rare [1][3].

Medication Planning and Blood Thinners

The most important rule for any medication is to follow the specific plan provided by your biopsy team and prescribing clinician. Do not stop, continue, or change your dose based on this guide alone.

If you take blood thinners (medicines that reduce clot formation), you must inform your healthcare team well before your appointment. This includes:

  • Antiplatelet drugs like aspirin or clopidogrel
  • Warfarin
  • Direct oral anticoagulants (DOACs) like apixaban, rivaroxaban, dabigatran, or edoxaban
  • Over-the-counter pain relievers, supplements, and vitamins

Research shows that routinely stopping low-dose aspirin, warfarin, or clopidogrel is often unnecessary for a thyroid FNA, as bleeding rates remain very low even when these medications are continued [4][5][6]. However, decisions must be made on a case-by-case basis by your doctors. For DOACs, decisions depend heavily on your kidney function, bleeding history, and why you take the medication, as serious bleeding has occasionally been reported when continued [7][8]. Always contact your clinic ahead of time if you haven’t received a specific plan for your medications.

What to Expect During the Biopsy

Because you have a multinodular goiter, your doctor will first use the ultrasound to look at all your nodules and decide which specific one(s) need to be sampled.

During the procedure, you will lie on your back with your neck slightly extended. The doctor will clean the skin over your thyroid. Some clinics offer a local anesthetic (numbing medicine) to reduce the initial pinch, while others do not. Studies show mild discomfort is typical either way, and you can discuss your preference and anxiety with your doctor beforehand [2][9].

Using ultrasound guidance, the doctor inserts a thin needle into the targeted nodule [1]. They typically make two to three passes (brief needle insertions) to ensure specimen adequacy—meaning they collect enough representative cells for a cytologist or pathologist (doctors who specialize in interpreting cells and tissues) to evaluate [10][11]. If a nodule is large or cystic (mostly filled with fluid), a few additional passes may be needed [12]. Each pass takes only a few seconds. The biopsy itself usually takes 10 to 15 minutes [13], though your full appointment will take longer to account for registration, ultrasound review, and observation.

Results and Next Steps

Having an “adequate” sample means the laboratory has enough cells to interpret, but it does not guarantee a simple yes-or-no answer. Your cytology results may be benign (non-cancerous), malignant (cancerous), indeterminate, or nondiagnostic (insufficient cells to make a call). If the result is indeterminate or nondiagnostic, your doctor may recommend a repeat FNA, additional testing, or watchful waiting [14][15][16].

Aftercare and Recovery

After the biopsy, your doctor will likely apply light pressure to your neck. Mild soreness, minor swelling, and a small hematoma (a stable, superficial bruise or collection of blood under the skin) are normal and usually require no treatment [3]. Your clinic will provide specific instructions, which often include applying an ice pack and avoiding vigorous physical activity for the rest of the day [1].

For mild pain, acetaminophen is often recommended, but you should discuss this with your clinician or pharmacist—especially if you have liver disease, drink alcohol regularly, or take warfarin. Do not take NSAIDs (like ibuprofen, naproxen, or extra aspirin) without your doctor’s explicit approval, as these can increase your risk of bleeding.

When to Seek Urgent Medical Care

While serious complications are exceptionally rare, you should seek emergency medical care immediately—do not wait for an after-hours callback—if you experience any signs of airway compromise or deep bleeding:

  • Rapidly expanding neck swelling [17][18]
  • Difficulty breathing or breathlessness [17][19]
  • Inability to swallow or new, worsening swallowing difficulty [19]

Additionally, contact your biopsy team urgently or go to the emergency room if you notice:

  • Voice changes or hoarseness that get worse over time [18]
  • Fever accompanied by progressive redness, severe pain, and swelling, which could signal a rare infection rather than a bleed [20]

Common questions in this guide

Do I need to fast before a thyroid FNA?
Most people do not need to fast before a thyroid fine-needle aspiration. Follow your clinic's instructions if they give you different directions, and ask whether you should take your usual medicines.
Should I stop my blood thinner before thyroid FNA?
Do not stop, continue, or change a blood thinner on your own. Tell the biopsy team and the clinician who prescribed it about every blood thinner, pain reliever, supplement, and vitamin; they will decide whether any change is needed based on your medicine and health history. Many people can continue some medicines, but the plan is individualized.
What happens during a thyroid FNA for multinodular goiter?
You lie on your back with your neck slightly extended while ultrasound is used to choose the nodule or nodules to sample. A thin needle collects cells, usually with two or three brief passes; the biopsy itself often takes 10 to 15 minutes, although the appointment lasts longer.
How painful is a thyroid FNA, and is numbing medicine used?
Most people feel mild discomfort or a brief pinch. Some clinics use a local anesthetic, while others do not, so discuss pain, anxiety, and your preference with your doctor before the procedure.
What can thyroid FNA results show?
The sample may be reported as benign, meaning noncancerous; malignant, meaning cancerous; indeterminate; or nondiagnostic, meaning there were not enough cells to interpret. An indeterminate or nondiagnostic result may lead to a repeat biopsy, additional testing, or monitoring, depending on your situation.
What should I do after thyroid FNA, and when is it an emergency?
Mild soreness, swelling, or bruising is common; follow your clinic's instructions, which may include an ice pack and avoiding strenuous activity for the rest of the day. Seek emergency care right away for rapidly increasing neck swelling, trouble breathing, or inability or worsening difficulty swallowing, and contact your team urgently for worsening hoarseness or fever with redness, severe pain, and swelling.
What pain medicine can I take after thyroid FNA?
Acetaminophen may be recommended for mild pain, but check with your clinician or pharmacist, especially if you have liver disease, regularly drink alcohol, or take warfarin. Do not take ibuprofen, naproxen, or extra aspirin unless your doctor specifically approves them because they can increase bleeding risk.

Related questions

Toxic vs. Nontoxic Multinodular Goiter: What's Different? Can Bethesda III or IV Thyroid Nodules Avoid Surgery? How Accurate Are ThyroSeq & Afirma in Indeterminate Nodules? When Should Benign Thyroid Nodules Be Rebiopsied or Treated? Airway or Esophagus Compression in Multinodular Goiter?
Show more
Is Pemberton's Sign Dangerous With a Substernal Goiter? When Do I Need a CT or MRI for a Multinodular Goiter? Can a Multinodular Goiter Cause Hoarseness? When to Test What Is Next After a Bethesda I Nondiagnostic Thyroid FNA? Is Thyroid Cancer Risk Higher With Multinodular Goiter? Is Sudden Painful Goiter Swelling a Thyroid Emergency? Should I Take Iodine Supplements With a Multinodular Goiter? Is Multinodular Goiter Hereditary? Who Needs Screening? What Causes Multinodular Goiter and Can It Be Prevented? Can Toxic Multinodular Goiter Increase Heart or Bone Risks? Can Nontoxic Multinodular Goiter Become Toxic Over Time? How Do Radiation and Family History Affect Thyroid Nodules? Why Is a Thyroid Scan Needed for Multinodular Goiter? Why Aren’t the Largest Thyroid Nodules Biopsied First?

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References

References (20)
  1. 1

    A Comprehensive Assessment of the Harms of Fine-Needle Aspiration Biopsy for Thyroid Nodules: A Systematic Review.

    Park JY, Choi W, Hong AR, et al.

    Endocrinology and metabolism (Seoul, Korea) 2023; (38(1)):104-116 doi:10.3803/EnM.2023.1669.

    PMID: 36891657
  2. 2

    Patient Discomfort in Relation to Thyroid Nodule Fine-Needle Aspiration (FNA) Performed with or without Parenteral and/or Topical Anesthetic.

    Cao C, Jasim S, Cherian A, et al.

    Endocrine practice : official journal of the American College of Endocrinology and the American Association of Clinical Endocrinologists 2020; (26(12)):1497-1504 doi:10.4158/EP-2020-0403.

    PMID: 33471742
  3. 3

    Do anticoagulation medications increase the risk of haematoma in ultrasound-guided fine needle aspiration of thyroid lesions?

    Khadra H, Kholmatov R, Monlezun D, Kandil E

    Cytopathology : official journal of the British Society for Clinical Cytology 2018; (29(6)):565-568 doi:10.1111/cyt.12608.

    PMID: 29969159
  4. 4

    Fine-needle aspiration cytology for neck lesions in patients with antithrombotic/anticoagulant medications: systematic review and meta-analysis.

    Ahn D, Kwak JH, Lee GJ, Sohn JH

    European radiology 2024; (34(10)):6843-6851 doi:10.1007/s00330-024-10709-4.

    PMID: 38536462
  5. 5

    Adverse events unlikely after fine-needle aspiration biopsies of thyroid nodules in patients on low-dose aspirin: a prospective controlled systematic single center analysis.

    Cordes M, Götz TI, Kuwert T, Schmidkonz C

    Nuklearmedizin. Nuclear medicine 2023; (62(1)):34-37 doi:10.1055/a-1972-9372.

    PMID: 36623828
  6. 6

    Effect of Anticoagulation Medication on the Thyroid Fine-Needle Aspiration Pathologic Diagnostic Sufficiency Rate.

    Denham SL, Ismail A, Bolus DN, Lockhart ME

    Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine 2016; (35(1)):43-8 doi:10.7863/ultra.15.03044.

    PMID: 26614792
  7. 7

    Ultrasound-guided fine-needle aspiration biopsy of thyroid nodules in patients taking novel oral anticoagulants.

    Lyle MA, Dean DS

    Thyroid : official journal of the American Thyroid Association 2015; (25(4)):373-6 doi:10.1089/thy.2014.0307.

    PMID: 25584817
  8. 8

    A Case of Diffuse Thyroid Hematoma after Ultrasound-Guided Fine Needle Aspiration.

    Lee JG, Chang YS, Kim BY

    Medicina (Kaunas, Lithuania) 2023; (59(4)) doi:10.3390/medicina59040690.

    PMID: 37109648
  9. 9

    Effect of local anesthesia on pain scale and specimen adequacy in fine-needle aspiration biopsy of thyroid nodules for liquid-based cytology.

    Lee TL, Wei PY, Tai SK

    Scientific reports 2022; (12(1)):18498 doi:10.1038/s41598-022-23031-0.

    PMID: 36323716
  10. 10

    Thyroid Ultrasound-Guided Fine-Needle Aspiration: The Positive Influence of On-Site Adequacy Assessment and Number of Needle Passes on Diagnostic Cytology Rate.

    de Koster EJ, Kist JW, Vriens MR, et al.

    Acta cytologica 2016; (60(1)):39-45 doi:10.1159/000444917.

    PMID: 26982029
  11. 11

    Comparison of Number of Passes and Cytopathological Specimen Adequacy for Thyroid Fine-Needle Aspiration Biopsy in the Absence of an On-Site Pathologist.

    Kuzan TY, Canbey Goret C

    European thyroid journal 2020; (9(1)):49-54 doi:10.1159/000504094.

    PMID: 32071902
  12. 12

    Conditions associated with the need for additional needle passes in ultrasound-guided thyroid fine-needle aspiration with rapid on-site pathology evaluation.

    Zargham R, Johnson H, Anderson S, Ciolino A

    Diagnostic cytopathology 2021; (49(1)):105-108 doi:10.1002/dc.24605.

    PMID: 32870607
  13. 13

    Effects of nodule characteristics on sampling number and duration of thyroid fine-needle aspiration biopsy: size does not matter, but cystic degeneration ratio does.

    Cengic I, Tureli D, Altas H, et al.

    Acta radiologica (Stockholm, Sweden : 1987) 2017; (58(3)):286-291 doi:10.1177/0284185116649797.

    PMID: 27235454
  14. 14

    Optimal timing for a repeat fine-needle aspiration biopsy of thyroid nodule following an initial nondiagnostic fine-needle aspiration.

    Deniwar A, Hammad AY, Ali DB, et al.

    American journal of surgery 2017; (213(2)):433-437 doi:10.1016/j.amjsurg.2016.04.010.

    PMID: 27475222
  15. 15

    Predictors of Repeat Nondiagnostic Cytology in Thyroid Fine-Needle Aspiration.

    Castillo F, Tafur M, Lin C, et al.

    Canadian Association of Radiologists journal = Journal l'Association canadienne des radiologistes 2026; 8465371261442120 doi:10.1177/08465371261442120.

    PMID: 42052626
  16. 16

    Repeat thyroid fine needle aspiration: a key step from nondiagnostic cytology to histologic diagnosis.

    Ren D, Gilani SM

    Journal of the American Society of Cytopathology 2026; (15(4)):269-277 doi:10.1016/j.jasc.2026.03.003.

    PMID: 42103532
  17. 17

    Endovascular treatment of massive hemorrhage arising from inferior thyroid artery after fine needle aspiration of thyroid: a case report.

    Jang HS, Kim Y

    BMC surgery 2021; (21(1)):220 doi:10.1186/s12893-021-01184-5.

    PMID: 33906624
  18. 18

    Life-Threatening Neck Hematoma After Fine-Needle Aspiration of a Thyroid Nodule in a Patient With End-Stage Renal Disease.

    Yasin H, Khetani S, Oktaei H

    AACE endocrinology and diabetes 2026; (13(3)):384-387 doi:10.1016/j.aed.2026.01.010.

    PMID: 42221411
  19. 19

    A Rare and Severe Complication Following Thyroid Fine Needle Aspiration: Retropharyngeal Cellulitis.

    Cesareo R, Naciu A, Barberi A, et al.

    International journal of endocrinology and metabolism 2016; (14(4)):e39174 doi:10.5812/ijem.39174.

    PMID: 28123438
  20. 20

    A Thyroid Abscess Developed Three Months After a Fine Needle Aspiration of a Colloid Cyst: A Case Report.

    Jovic A, Strbacko I, Bilos J

    Cureus 2026; (18(5)):e108349 doi:10.7759/cureus.108349.

    PMID: 42255826

This page is for informational purposes only and does not constitute medical advice. Your biopsy team and prescribing clinician should provide individualized instructions about blood thinners, pain medicines, and symptoms that need urgent care.