Severe pain during injection: a warning sign

In daily practice, the patient complains of pain with almost every injection. The professional learns to calibrate: "this is what to expect for this area". And that calibration is exactly what makes the difference when a pain appears that is not the expected one. In orofacial harmonization (HOF), disproportionate pain during or right after a filler injection is one of the earliest signs that something may be wrong, and it often appears before any visible change in the skin.

This page covers how to interpret pain as a warning sign, what to do right away and how to document. It does not describe injection technique, planning, depth or points, and gives no doses. Management is up to the qualified professional, with up-to-date protocols and in line with the rules of their professional council.

Why can pain be the first sign?

If a vessel is blocked or compressed by the product, the tissue it supplies can run short of oxygen, which is known as ischemia. Ischemia is usually painful, and the pain can appear immediately. That is why, in many reports of vascular occlusion, the initial complaint is intense pain, greater than expected for the procedure, and only afterward do other changes appear.

This pain has features that set it apart from needle pain:

• Intensity greater than predicted for the area and the technique;
• Persistence or growth after the needle comes out, instead of quick relief;
• Location that follows the territory of a vessel, not just the injected point;
• Association with pallor, net-like mottling, coldness, altered sensation or visual symptoms.

See the risk map by area in vascular danger zones of the face and the approach by area in glabellar vascular occlusion, nasal vascular occlusion, vascular occlusion in the nasolabial fold and lip vascular occlusion.

How do you interpret pain alongside anesthesia?

Anesthesia complicates the reading. It can reduce pain, which delays the alert, or anesthetic with vasoconstrictor can cause pallor that resembles an occlusion, confusing the exam. That is why the rule is to combine signs, not rely on a single one.

For an overview of anesthesia, see local anesthesia in HOF: overview and topical anesthetics: composition and risks. To quantify pain, some clinics use the visual analog pain scale, which helps document and compare.

What should you watch for besides pain?

Pain is one sign. A full exam looks at several things at once.

Skin signs are described in skin blanching and livedo reticularis. The presence of any visual symptom changes the urgency: see visual complication after filler.

What should you do right away?

There is no routine "test" that rules out occlusion without observation. When in doubt, the prudent stance is to act. Office preparation is described in emergency kit for the HOF office and hyaluronidase in the office.

How do you prevent it?

Prevention combines knowledge, preparation and attitude:

• know the vascular anatomy of the area and its variations (see vascular anatomical variations and vascular anastomoses of the face);
• tell the patient, before starting, to report immediately any pain outside what is expected;
• use a safety "time-out" before injecting (see safety time-out before injecting);
• keep talking during the procedure, asking how the patient is doing;
• have a written protocol and a trained team;
• respect the limits of your experience and refer what goes beyond them.

Technical measures such as aspiration before injection are debated in the literature and do not eliminate the risk. No single measure replaces the whole: anatomy, care, attention to the patient and readiness to act.

How do you talk to the patient in the moment?

If pain appears, communication needs to be calm and direct. Acknowledge what the patient reports, explain that you will stop to assess and ask them to keep telling you what they feel. Avoid phrases like "that's normal" before assessing. Then, depending on the case, follow the guidance in communicating suspected vascular occlusion to the patient and communicating a complication to the patient.

How do you document?

Write down the patient's account in their own words, the time the pain started, the intensity (by scale, if used), the exam findings, the product, the area, the actions taken and the contacts made. Photograph with permission. See recording the complication in the patient record and patient records and documentation in HOF. In relevant cases, consider an adverse event report (in Brazil, to Notivisa).

Harmy is not part of this management: it helps with talking about the plan, using an illustrative projection made from a frontal photo, an illustrative simulation, not a promise of results. It does not assess vascular risk or indicate where or how to inject.