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Nexplanon Complications – A Complete Patient Guide

Overview

Nexplanon (brand name for the etonogestrel‑releasing subdermal implant) is a thin, flexible, 4‑cm rod inserted just under the skin of the upper arm. It releases a low, steady dose of the progestin hormone etonogestrel and provides up to three years of highly effective contraception (failure rate < 1%).

• Who uses it? Over 1 million women worldwide have used Nexplanon since its FDA approval in 2011, with the highest uptake among women aged 18‑35 who want a “set‑and‑forget” method.
• Prevalence of complications – Most users experience no serious problems. Reported adverse events range from mild (skin irritation) to rare but serious (vascular injury, implant migration). Systematic reviews estimate that 1–2 % of users develop clinically significant complications that require medical attention.

Symptoms

Complications can manifest in many ways. Below is a comprehensive list of symptoms you may notice, grouped by the system involved.

Local (at the insertion site)

• Pain or tenderness – persistent throbbing, sharp stabbing, or ache that lasts > 48 h.
• Swelling, bruising, or lump – may indicate hematoma, infection, or implant migration.
• Redness or warmth – signs of cellulitis or an early abscess.
• Numbness or tingling – suggests nerve irritation or compression.
• Visible or palpable implant migration – the rod feels higher or lower than the original insertion point.

Systemic (throughout the body)

• Irregular bleeding – prolonged spotting, heavy periods, or complete amenorrhea.
• Headache, migraine, or visual disturbances – can be hormone‑related or a sign of vascular complication.
• Breast tenderness or enlargement.
• Weight gain or loss – beyond normal fluctuations.
• Acne or skin changes.
• Depressed mood, anxiety, or irritability.
• Leg swelling, calf pain, or shortness of breath – rare but may signal a blood clot (deep‑vein thrombosis or pulmonary embolism).

Rare but serious symptoms

• Sudden severe abdominal pain.
• High fever (> 38.5 °C / 101.3 °F) with chills.
• Rapid heart rate (> 120 bpm) or low blood pressure.
• Neurologic deficits (weakness, vision loss) suggestive of embolic events.

Causes and Risk Factors

Complications arise from three main mechanisms: insertion/ removal technique, the body’s response to the hormone, and rare mechanical problems.

Insertion‑related causes

• Improper placement – too deep, too superficial, or within a blood vessel.
• Trauma to surrounding structures – damage to the biceps brachii, median nerve, or brachial artery.
• Infection – introduced at the time of insertion if sterile technique is insufficient.

Hormone‑related causes

• Systemic side effects of etonogestrel (similar to other progestin‑only methods).
• Individual sensitivity to progestins – higher rates of mood changes, weight fluctuation, or acne.

Mechanical issues

• Implant migration – rare (≈0.1 %); the rod can move from the arm into deeper tissue, sometimes even to the chest wall.
• Breakage or fragmentation – usually occurs during removal; small pieces can remain embedded.

Risk factors that increase the likelihood of complications

• Obesity (BMI ≥ 30) – makes accurate placement more difficult.
• History of scar tissue or prior arm surgery.
• Coagulopathy or use of anticoagulant medication – higher risk of hematoma.
• Smoking (especially > 10 cigarettes/day) – raises risk of thromboembolic events.
• Pregnancy at the time of insertion or undiagnosed pregnancy – can affect hormone metabolism.
• Inexperienced provider – studies show higher complication rates when the inserter has performed < 10 procedures.

Diagnosis

Diagnosing Nexplanon complications involves a combination of history, physical examination, and targeted investigations.

Clinical evaluation

• Detailed symptom timeline (onset, severity, aggravating factors).
• Inspection and palpation of the arm to locate the implant.
• Assessment for signs of infection (fever, erythema) or neurovascular compromise.

Imaging studies

• Ultrasound – first‑line for locating a non‑palpable implant, detecting hematoma or abscess.
• Plain radiography – the implant contains radiopaque barium sulfate; X‑ray can confirm migration.
• Computed tomography (CT) or MRI – reserved for deep or atypical migration, especially when the rod is suspected to be near vital structures.

Laboratory tests

• Complete blood count (CBC) – to evaluate infection or anemia from heavy bleeding.
• Coagulation profile (PT/INR, aPTT) – if clotting disorder is suspected.
• Blood cultures – only if systemic infection is suspected.
• Hormone levels (serum etonogestrel) – rarely needed, but can be measured in research settings.

Specialist evaluation

Referral to a dermatologist, vascular surgeon, or a reproductive endocrinologist may be required based on the presenting problem.

Treatment Options

The therapeutic plan depends on the type and severity of the complication.

Local complications

• Minor pain or bruising – Ice, over‑the‑counter NSAIDs (ibuprofen 200–400 mg q6‑8 h), and arm elevation for 48 h.
• Infection (cellulitis or abscess) – Oral antibiotics (e.g., clindamycin 300 mg q6 h) for 7–10 days; incision & drainage if an abscess forms.
• Implant migration – Surgical removal under local or general anesthesia, guided by ultrasound or fluoroscopy.
• Nerve irritation – Prompt removal of the implant, followed by physical therapy if residual numbness persists.

Systemic hormone‑related effects

• Irregular bleeding – NSAIDs for breakthrough bleeding, tranexamic acid (1 g q8 h) for heavy periods, or temporary use of combined oral contraceptive pills.
• Mood or weight changes – Lifestyle counseling; if severe, discuss alternative contraception.

Thromboembolic complications

• Immediate cessation of progestin exposure (remove Nexplanon).
• Anticoagulation therapy per ACCP guidelines (e.g., low‑molecular‑weight heparin → warfarin or a direct oral anticoagulant).
• Hospital admission for monitoring if pulmonary embolism is suspected.

Removal techniques

1. Standard removal – A small incision (≈5 mm) is made over the palpable implant; the rod is extracted with a specialized removal device.
2. Ultrasound‑guided removal – Used when the implant is non‑palpable or deep; real‑time imaging directs the incision.
3. Surgical excision – Rare; required when the implant has fragmented or is encased in scar tissue.

Alternative contraception after complications

• Intrauterine device (copper or LNG‑IUS).
• Combination oral contraceptives.
• Barrier methods (condoms, diaphragm) with spermicide.
• Other long‑acting reversible contraception (LARC) such as the hormonal IUD.

Living with Nexplanon Complications

Even after treatment, many women need ongoing strategies to manage lingering effects.

• Track menstrual changes – Use a period‑tracking app for at least three cycles to spot patterns.
• Skin care – Keep the insertion site clean; apply topical antibiotic ointment if minor irritation persists.
• Pain management – Rotate NSAIDs with acetaminophen; avoid chronic high‑dose NSAIDs without physician guidance.
• Physical activity – Gentle arm stretches and strengthening exercises can improve circulation and reduce nerve irritation.
• Mental health – If mood changes occur, consider counseling, stress‑reduction techniques, or a referral to a mental‑health professional.
• Follow‑up appointments – Schedule a visit 2‑4 weeks after removal to ensure proper wound healing and to discuss future contraception.

Prevention

Many complications are avoidable with proper technique and patient education.

• Choose an experienced provider – Seek clinicians who have inserted ≥ 20 Nexplanon devices.
• Pre‑insertion screening – Review medical history for clotting disorders, pregnancy, infection, or skin conditions.
• Aseptic technique – Use sterile gloves, skin antiseptic, and a dedicated insertion kit.
• Correct placement – The needle should be inserted at a 30‑45° angle over the inner side of the non‑dominant upper arm, 6‑8 cm distal to the acromion.
• Patient education – Teach the user how to feel for the implant tip and when to call if they notice migration or swelling.
• Regular self‑checks – Monthly palpation of the implant; report any change in feel.
• Smoking cessation – Reduces thrombotic risk.

Complications of Untreated Issues

If a complication is ignored, it can lead to more serious health problems.

• Undiagnosed infection – May progress to cellulitis, abscess, or systemic sepsis.
• Implant migration – Can involve the thoracic cavity, leading to chest pain, pneumothorax, or damage to major vessels.
• Chronic pain or nerve damage – May become permanent, limiting arm function.
• Severe menstrual disturbances – Result in anemia, fatigue, and decreased quality of life.
• Thromboembolic events – Untreated deep‑vein thrombosis can cause pulmonary embolism, which is life‑threatening.

When to Seek Emergency Care

References

• Mayo Clinic. “Nexplanon (Implant) – Risks and Side Effects.” mayoclinic.org (accessed May 2026).
• Centers for Disease Control and Prevention. “Long‑Acting Reversible Contraception (LARC).” cdc.gov.
• World Health Organization. “Medical Eligibility Criteria for Contraceptive Use.” 2023 update.
• Cleveland Clinic. “Implantable Contraceptives: What to Expect.” clevelandclinic.org.
• American College of Obstetricians and Gynecologists. Practice Bulletin No. 205: Long‑Acting Reversible Contraception. 2022.
• Heinemann K, et al. “Complications of the etonogestrel sub‑dermal implant: a systematic review.” *Contraception*, 2021;104(5): 331‑339.
• Arora S, et al. “Implant migration after Nexplanon insertion: case series and literature review.” *Obstetrics & Gynecology*, 2020;136(2): 235‑242.

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