Do PRP Injections Hurt? What to Expect for Pain and Recovery

Written by Dr. Jeffrey Peng, MD — Board-Certified Sports Medicine Physician

Published: March 1, 2026 | Last Updated: March 1, 2026

One of the most common questions I hear from patients considering platelet-rich plasma therapy is: "Do PRP injections hurt?" Most people assume it is just another quick, relatively painless shot. And while that is often true during the procedure itself, the real surprise comes a few hours later — and it can catch people completely off guard. In my practice, I have helped thousands of patients navigate PRP injections and other orthobiologic treatments, and the post-injection pain is consistently the part that surprises people the most. In this article, I will walk you through exactly what PRP feels like — during the procedure and in the days and weeks that follow — and share the step-by-step recovery protocol I give every patient.

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What Does the PRP Procedure Feel Like?

When people hear the words "injection" and "platelet-rich plasma," they often imagine something intense or even frightening. The reality, however, is much more manageable than most patients expect. The process begins with a standard blood draw — the same sensation as any routine blood test. Your blood is then processed in a centrifuge to concentrate the platelets, which takes approximately twenty to thirty minutes.

Once the PRP is ready, I prepare the treatment area and apply a small amount of local anesthetic to numb the skin and underlying tissues. This significantly reduces discomfort during the injection itself. Patients may feel some pressure or a dull ache during the injection, particularly when treating deeper structures like a tendon or joint, but it is not the sharp, stinging pain that people often fear. In fact, most patients describe it as pressure, tightness, or a deep squeeze rather than actual pain. The injection typically lasts only a few seconds to a minute or two, depending on the area being treated.

Why Does PRP Hurt After the Injection?

The part most people do not expect is what happens a few hours after the injection. Once the local anesthetic wears off, the pain can ramp up significantly — and for some patients, it becomes quite intense. This is the number one source of anxiety I see in follow-up conversations.

Here is what most people do not realize: this post-injection pain is not a sign that something went wrong. It is actually a sign that the PRP is doing exactly what it is supposed to do. Unlike cortisone injections, which suppress inflammation for fast but temporary relief, PRP takes the opposite approach. It deliberately kickstarts your body's natural healing process — and the first step in that process is inflammation.

Research confirms this mechanism. A study published in The American Journal of Sports Medicine demonstrated that PRP activates proinflammatory signaling pathways — specifically TNFα and NF-κB — in tendon fibroblasts, triggering a transient inflammatory event that initiates tissue regeneration (Hudgens et al., 2016). When PRP is injected, the concentrated platelets release powerful growth factors that signal your immune system, boost blood flow, and set off an inflammatory cascade. This is what causes the pain, swelling, and stiffness you may feel during the first few days — and while it can be uncomfortable, this early inflammation is necessary for long-term healing.

How Long Does PRP Pain Last? Tendons vs. Joints

The duration of the inflammatory phase depends on whether the PRP was injected into a tendon or a joint. Understanding this distinction can help set realistic expectations for your recovery.

For tendon injections — such as the rotator cuff, Achilles tendon, or lateral epicondyle (tennis elbow) — the inflammatory phase can last up to two full weeks. During this time, it is normal to feel soreness, stiffness, and sensitivity. That discomfort is not a setback; it reflects your body breaking down damaged tissue and beginning the repair process. Tendons have relatively poor blood supply and heal slowly, so most patients will not feel meaningful improvement until approximately six to eight weeks after the injection, and for some it may take up to ten. A review published in Experimental and Therapeutic Medicine found that PRP promotes tendon healing through neovascularization, cell proliferation, and extracellular matrix reorganization — a process that requires time and an intact inflammatory response (Liu et al., 2021).

For joint injections — particularly for knee osteoarthritis — the inflammatory response tends to resolve more quickly. Most patients find that pain and swelling improve within about a week, and range of motion begins to return. Joints also tend to respond sooner to PRP. Many patients notice real improvements such as less stiffness and better mobility by weeks three to four. A systematic review and meta-analysis of 18 randomized controlled trials confirmed that PRP provides significantly better outcomes for knee osteoarthritis compared to hyaluronic acid, with a mean improvement of 44.7% on the WOMAC scale versus 12.6% for HA (Belk et al., 2020). Additionally, a meta-analysis of 14 randomized controlled trials showed that PRP significantly reduced pain and improved physical function at three, six, and twelve months — without increasing the risk of post-injection adverse events (Shen et al., 2017).

PRP Recovery Protocol: A Phase-by-Phase Guide

The real challenge is that many people never make it to the long-term relief because the early pain can be intense. Without clear guidance, it is easy to panic, do the wrong things, or give up too soon. I have seen patients unintentionally sabotage their recovery simply because they did not know how to manage those first few days. Below is the exact recovery protocol I provide to every patient after a PRP injection.

Phase 1: Days 0–3 (Protection)

The goal during the first three days is protection. This is when the inflammatory response needs to kick in, so it is critical not to interfere with it. Avoid all anti-inflammatory medications (ibuprofen, naproxen, aspirin), do not apply ice, and avoid aggressive soft tissue work like deep massage or foam rolling on the treated area. Steer clear of exercise and repetitive movement involving the injected area. Instead, apply heat a few times per day and give your body the space it needs to begin healing.

Phase 2: Days 4–14 (Gentle Movement)

Starting on day four, you can begin to reintroduce gentle movement. Begin with light daily stretching and easy aerobic activity such as walking. By day seven, start incorporating light strengthening exercises approximately three times per week. Anti-inflammatory medications should still be avoided, and soft tissue work should remain controlled and minimal. Think of this phase as easing your way back into activity while continuing to respect the healing process.

Phase 3: Weeks 3–6 (Progressive Strengthening)

By this stage, the inflammation has mostly resolved, and the focus shifts to rebuilding strength and endurance. Progress both your aerobic and strengthening exercises, ideally training three times per week. If possible, continue to avoid anti-inflammatory medications so you do not blunt the ongoing repair process. I typically recommend a follow-up visit sometime between weeks four and eight to monitor progress and fine-tune the rehabilitation plan as needed.

One important thing to keep in mind: these restrictions are specific to the body part that was treated. If you received a PRP injection in your right shoulder, it is just your right shoulder that needs protection — you can still walk, bike, and train your lower body. If the injection was in your left knee, you can absolutely do upper body strength training as long as you are not loading that knee. The key is to avoid overloading the injected area while staying active in other safe and supportive ways.

What to Avoid After a PRP Injection

In the first two weeks following a PRP injection, it is essential to avoid NSAID medications such as ibuprofen, naproxen, and aspirin. These medications work by blocking inflammation — but inflammation is exactly what is needed for PRP to work. Suppressing it can blunt the healing response and may reduce the overall effectiveness of the treatment. If pain becomes difficult to manage, acetaminophen (Tylenol) is the best option. While some in vitro studies have suggested acetaminophen may interfere with platelet activity, in my clinical experience performing thousands of PRP procedures, it has remained a safe and reliable way to manage pain without disrupting the healing process.

Another common mistake is using ice after a PRP injection. While it may seem like the obvious choice for managing swelling, icing actually reduces inflammation — and with PRP, the inflammatory response is a critical part of the healing mechanism. Instead, apply heat. A warm compress or heating pad improves blood flow, relaxes surrounding muscles, and can feel significantly more soothing, especially for areas like the shoulder, elbow, or knee.

As the pain begins to ease — typically after a few days — gentle movement is encouraged. Light range-of-motion exercises and basic stretching can help maintain flexibility and prevent stiffness, as long as they do not aggravate symptoms. The key is to listen to your body, respect the flare, and move mindfully. This short window of discomfort is what sets the stage for long-term healing. If managed correctly, it gives your body the best possible environment to repair and rebuild.

The Bottom Line

PRP injections are generally well-tolerated during the procedure itself, but the post-injection inflammatory response can be surprisingly intense. Understanding that this pain is a necessary part of the healing process — not a complication — is essential for managing expectations and staying on track with your recovery. A 2021 meta-analysis of 23 randomized controlled trials confirmed that PRP is more effective than conservative treatments including oral NSAIDs and hyaluronic acid for relieving knee osteoarthritis symptoms, with no significant increase in adverse event rates (Hong et al., 2021). By following a structured recovery protocol — protecting the area early, gradually reintroducing movement, and avoiding NSAIDs and ice — you give PRP the best chance to deliver the long-term relief it is designed to provide. If you are considering PRP therapy, I encourage you to learn more about PRP injections on my website or schedule a consultation to discuss whether this treatment is right for your condition.

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References

Hudgens JL, Sugg KB, Grekin JA, Gumucio JP, Bedi A, Mendias CL. Platelet-Rich Plasma Activates Proinflammatory Signaling Pathways and Induces Oxidative Stress in Tendon Fibroblasts. Am J Sports Med. 2016;44(8):1931-1940. doi:10.1177/0363546516637176

Liu X, Zhang R, Zhu B, et al. Effects of leukocyte- and platelet-rich plasma on tendon disorders based on in vivo and in vitro studies (Review). Exp Ther Med. 2021;21(6):639. doi:10.3892/etm.2021.10071

Belk JW, Kraeutler MJ, Houck DA, Goodrich JA, Dragoo JL, McCarty EC. Platelet-Rich Plasma Versus Hyaluronic Acid for Knee Osteoarthritis: A Systematic Review and Meta-analysis of Randomized Controlled Trials. Am J Sports Med. 2021;49(1):249-260. doi:10.1177/0363546520909397

Shen L, Yuan T, Chen S, Xie X, Zhang C. The temporal effect of platelet-rich plasma on pain and physical function in the treatment of knee osteoarthritis: systematic review and meta-analysis of randomized controlled trials. J Orthop Surg Res. 2017;12(1):16. doi:10.1186/s13018-017-0521-3

Hong M, Cheng C, Sun X, et al. Efficacy and Safety of Intra-Articular Platelet-Rich Plasma in Osteoarthritis Knee: A Systematic Review and Meta-Analysis. Biomed Res Int. 2021;2021:2191926. doi:10.1155/2021/2191926

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Disclaimer: This content is for educational purposes only and does not substitute for the medical advice of a physician. Always seek the advice of your physician with any questions you may have regarding your health or a medical condition.