Most people feel a noticeable increase in pain for about 24 to 72 hours after a PRP injection. That flare usually fades within a week, and the soreness tends to ease day by day rather than all at once. A smaller number of people stay sore for up to two weeks, and that is still within the normal range reported in clinical practice.
Platelet-rich plasma, or PRP, is made by spinning a sample of your own blood to concentrate the platelets and the growth factors they carry. It is injected into injured tissue — tendons, ligaments, joints, sometimes skin and hair. The injection itself is not the painful part for most people. The days right after are.
How Long Does Pain Last After A PRP Injection?
Expect the worst of it in the first three days. Many patients describe a deep ache or a throbbing pressure that starts a few hours after the needle goes in and peaks somewhere between 24 and 48 hours. From there it usually improves steadily. By the end of the first week, most people are back to their baseline level of discomfort or better.
The reason for the flare is not a complication. It is the treatment working. Platelets release signaling proteins that draw inflammatory cells into the area, and that local inflammatory response is part of how the tissue is thought to begin repairing. When clinicians tell patients to expect a temporary increase in pain, they are describing this response, not a problem with the injection.
A few things shift the timeline:
- Where you were injected. A tendon like the elbow or Achilles tends to hurt more in the days after than a joint injection.
- How inflamed the area already was. Tissue that was already angry reacts more.
- Whether a local anesthetic was mixed in. If it was, you may feel fine for a few hours and then sore once the numbing wears off.
- How much you use the area afterward. Too much activity in the first days tends to prolong the soreness.
None of this is a precise science. Two people with the same injection in the same spot can have very different first weeks.
What Does the Pain Actually Feel Like?
It is usually described as a deep, heavy ache rather than a sharp, stabbing pain. Many people say the area feels bruised, swollen, and warm. Some notice a sense of pressure, as if the joint or tendon is packed too tight. That pressure feeling is common and typically settles within the first few days.
Mild swelling and warmth around the injection site are expected. So is some stiffness, especially in the morning or after sitting still. These are signs of the local inflammatory response, and they usually track alongside the pain — as the ache fades, the swelling and stiffness fade with it.
What is not expected: spreading redness, a fever, or pain that gets steadily worse past the third day. Those point away from a normal response and toward something that needs a clinician’s eyes.
What Helps the Soreness and What Makes It Worse?
Rest the area for the first day or two. That does not mean bed rest — it means not loading the treated tendon or joint with the activity that caused the problem in the first place. Gentle movement within a comfortable range is generally fine and often encouraged.
Ice is commonly used in the first 24 to 48 hours to take the edge off. Some clinicians suggest it, some are neutral about it, and the evidence on whether icing helps or hinders the healing response is genuinely unsettled. Follow whatever your own clinician tells you, since protocols vary.
Over-the-counter pain relievers are where things get more complicated. Many clinicians advise avoiding anti-inflammatory drugs like ibuprofen and naproxen in the days right after a PRP injection, on the reasoning that the treatment depends partly on an inflammatory response and that blunting it could reduce the benefit. That reasoning is biologically plausible. Whether it actually changes outcomes in people has not been firmly settled by large trials. Acetaminophen is often suggested instead because it relieves pain without the same anti-inflammatory action. Ask your clinician before taking anything.
What clearly makes it worse: pushing through the pain. Returning to heavy lifting, running, or repetitive gripping in the first week tends to extend the soreness and may work against the goal of the injection.
How Does PRP Pain Compare to Other Injections?
PRP injections generally hurt more in the days afterward than a plain corticosteroid injection does. That is a common clinical observation, and it surprises people, because steroid shots are often described as the “stronger” treatment. The two work in opposite directions. Steroids suppress inflammation, so they often bring fast relief. PRP is thought to work by provoking a controlled healing response, and that response is uncomfortable.
| Injection type | Typical pain in the days after | When relief usually starts |
|---|---|---|
| PRP | Noticeable flare for about 24–72 hours, easing over 1–2 weeks | Often weeks, sometimes longer |
| Corticosteroid | Usually mild; sometimes a brief flare | Often within days |
| Local anesthetic only | Little to none once it wears off | Numbing effect only |
That last column is the part people underestimate. PRP is not a fast fix. The pain from the injection fades in days, but any benefit to the underlying injury typically takes weeks to months to show up, if it shows up at all. Injection pain and treatment effect run on completely different clocks.
When Should You Call Your Doctor?
Call if the pain is getting worse instead of better after the third day. A normal PRP response improves over time, even if slowly. Pain that climbs past day three is a signal to check in.
Also call for:
- Fever or chills
- Redness, streaks, or warmth that spreads beyond the injection site
- Swelling that keeps growing rather than settling
- Pus, drainage, or a bad smell at the site
- Numbness, tingling, or weakness that was not there before
Infection after a PRP injection is uncommon, but it is possible with any injection that breaks the skin. These signs are not something to wait out.
Does the Pain Mean the Injection Is Working?
No. This is one of the most common misunderstandings about PRP. A strong pain flare does not predict a good result, and a mild one does not predict a poor result. The intensity of the post-injection soreness and the eventual outcome are not reliably linked.
That matters because it is easy to read the discomfort as proof the treatment is doing something. The honest position is that we do not have good evidence tying the two together. What the soreness tells you is that your body mounted a local response to the injection — nothing more.
It is also worth being clear about the treatment itself. Evidence for PRP varies a lot by condition. For some tendon problems and certain joint conditions, studies show modest benefit over placebo or over other treatments. For others, the results are mixed or unimpressive. The evidence is not uniform, and anyone presenting PRP as broadly proven across the board is overstating it. Your clinician’s recommendation should rest on the specific condition being treated, not on PRP as a general category.
Frequently Asked Questions
How long does pain last after a PRP injection?
Most people have a noticeable pain flare for about 24 to 72 hours, with soreness easing over the first week. Some remain sore for up to two weeks, which is still considered normal.
Is it normal to be in more pain after a PRP injection?
Yes. A temporary increase in pain is expected and is tied to the local inflammatory response the injection is meant to trigger. Pain that keeps worsening after the third day is not normal and should be checked.
Can I take ibuprofen after a PRP injection?
Many clinicians advise avoiding anti-inflammatory drugs like ibuprofen in the days after PRP, though this is based mainly on biological reasoning rather than strong trial evidence. Ask your own clinician what to use for pain relief.
How long until PRP actually helps the injury?
Any benefit to the underlying injury usually takes weeks to months to appear, not days. The injection pain and the treatment effect run on separate timelines.
