Most people walk out of a trigger point injection appointment and go right back to their day. You can drive yourself home, return to work, and even do light exercise the same day. That said, the hours and days after the procedure involve a few sensations and precautions worth knowing about ahead of time.
What You’ll Feel Right Away
The injection site will likely feel numb for the first hour or two, similar to the feeling after dental work. This is from the local anesthetic used during the procedure. While the area is numb, the muscle that was causing you pain may already feel looser, which can be a strange combination of relief and temporary loss of sensation.
Some people also notice a brief twitch or a deep aching sensation in the muscle during or immediately after the injection. This is actually a good sign. It means the needle reached the trigger point and caused the taut band of muscle to release. That ache typically fades within a few hours.
Soreness in the First Few Days
Once the numbing wears off, expect some soreness at the injection site. This feels similar to a deep bruise or the tenderness you’d get after an intense workout. For most people, this post-injection soreness lasts one to three days. Some visible bruising around the site is also normal, especially if you tend to bruise easily or take blood-thinning medications.
Ice applied in 15-to-20-minute intervals can help with soreness and any minor swelling during the first 24 hours. After that initial period, gentle heat (a warm towel or heating pad) often works better to relax the muscle and encourage blood flow. Over-the-counter pain relievers like ibuprofen or acetaminophen can take the edge off, though it’s worth confirming with your provider if you’re on any other medications.
Activity and Exercise After the Injection
One of the biggest advantages of trigger point injections is how little downtime they require. You can go back to normal activities, including work and light exercise, right after the appointment. Physical therapy on the same day is fine, and some providers actually encourage it to take advantage of the muscle being relaxed.
The main restriction is heavy lifting. Avoid it for the first 24 hours, or at least until the numbness fully wears off. The reason is practical: when you can’t feel the full range of sensation in a muscle, you risk straining it without realizing it. Once full sensation returns, you can resume lifting and more intense workouts.
When Pain Relief Kicks In
The timeline for meaningful relief varies depending on what was injected and how chronic your trigger points are. Some people feel significantly better within hours, once the initial soreness passes. For others, it takes a few days for the full benefit to set in, especially if a corticosteroid was included in the injection (steroids take longer to reduce inflammation than anesthetics take to numb pain).
How long the relief lasts also varies widely. Some people get weeks or months of improvement from a single session. Others find that their trigger points return within a couple of weeks and need repeat injections. Trigger point injections tend to work best when combined with stretching, physical therapy, or posture correction that addresses the underlying cause of the muscle tension. Without those changes, the knots are more likely to re-form.
Repeat injections are common and generally safe when spaced appropriately. If your provider used a corticosteroid, there’s typically a limit on how frequently you can receive injections in the same area to avoid tissue weakening over time.
Side Effects That Are Normal
A few things can happen after trigger point injections that look alarming but are usually harmless:
- Bruising or skin discoloration at the injection site, which can last up to a week
- Lightheadedness or feeling faint shortly after the procedure, especially if you’re anxious about needles
- A temporary flare in pain before it gets better, sometimes called a “post-injection flare,” which usually resolves within 48 hours
- Minor bleeding at the puncture site
Signs Something Isn’t Right
Serious complications from trigger point injections are rare, but they do happen. Contact your provider if you notice increasing redness, warmth, or swelling at the injection site after the first day or two, as this could signal an infection. Fever or drainage from the site are also reasons to call. If the injection was near your upper back, shoulder, or neck, shortness of breath or chest pain in the hours afterward warrants immediate medical attention, as this could indicate a pneumothorax (a rare complication where the needle reaches the lung lining).
Progressive weakness in the injected muscle, numbness that doesn’t resolve after several hours, or pain that gets dramatically worse rather than gradually better are all worth reporting to your provider rather than waiting out.