Nearly everyone who gets a PRP injection goes home the same day. There’s no surgery or hospital stay, though the injection site may feel sore for a few days. In the guides we publish, recovery and side effects are the questions readers ask most often after price, and the answers depend on where the injection is given. A knee injection doesn’t settle the same way as a facial injection, and that difference matters more than many clinics explain upfront.
Recovery in the first 48 hours
The first two days follow a similar pattern across most injection sites. Expect mild pain, bruising, or swelling right where the needle went in. Clinics typically advise resting the treated area for the first day, then easing back into normal activity.
Because PRP uses your own blood rather than a donor product, the risk of a serious reaction in this window is low. That safety profile is part of why PRP has become the more common choice over stem cell injections for readers weighing both options.
Recovery time by injection site
Recovery length depends on where the injection goes and how much that area moves during daily activity.
| Injection site | Typical recovery | What to expect |
|---|---|---|
| Knee | 3 – 7 days | Soreness, mild swelling; reduced weight-bearing for 1–2 days |
| Shoulder | 3 – 7 days | Soreness with overhead movement; limited lifting short-term |
| Scalp (hair loss) | 1 – 3 days | Tenderness, mild swelling, possible short-lived headache |
| Face / under-eye | 1 – 3 days | Redness, mild swelling; makeup often held for a day |
| Neck | 2 – 5 days | Localized soreness; stiffness with movement |
These ranges describe typical cases. They are not guarantees. A larger joint under more daily load, like the knee, tends to need more careful pacing than a facial injection, simply because you use it more.
Documented side effects
The most common PRP side effects are injection-site pain, bruising, and temporary swelling or redness, and these typically fade within a day or two. A short-lived headache after a scalp injection is also reported. None of these require treatment beyond rest and, if needed, an over-the-counter pain reliever your provider approves.
Serious side effects are rare with PRP specifically, because the injected material comes from your own blood rather than a donor source. The main serious risk is infection at the injection site, which is possible if the blood draw or injection is not handled with proper technique. People with a bleeding disorder or an active infection near the planned injection site are usually told to avoid PRP until that clears.
PRP recovery versus stem cell recovery
Both procedures are outpatient and same-day, but the recovery window differs slightly. PRP and stem cell injections both leave you free to go home right after treatment, and neither requires surgery. PRP soreness tends to run one to two days shorter than stem cell soreness at a comparable joint, likely reflecting the smaller volume and simpler processing involved in a PRP draw.
When to call a doctor
Most soreness and swelling improve steadily after the first two to three days. Call your provider if pain worsens instead of easing, if redness spreads beyond the injection point, if you develop a fever, or if warmth and swelling increase rather than settle. These can signal infection, which is uncommon with PRP but not impossible, and catching it early matters.
Do not wait for a scheduled follow-up if something feels wrong. A same-day call to the clinic that treated you is the right first step, since they know exactly what was injected and where.
Aftercare that actually helps recovery
A few concrete habits shorten the rough first days more reliably than waiting it out. Ice the injection site in short sessions during the first 24 to 48 hours to control swelling, and keep the area clean and dry to reduce infection risk. Many providers also advise avoiding ibuprofen and other NSAIDs in the days immediately before and after treatment, since these medications blunt the inflammatory response that PRP is designed to trigger. Acetaminophen is the more common substitute clinics recommend for pain, since it does not carry the same anti-inflammatory effect.
Light movement, rather than complete rest, is usually encouraged once the first day or two of soreness passes, since gentle use of the treated area supports the healing process better than full immobilization.
What slows recovery down
Recovery runs longer for some patients than others, and a few factors explain most of the difference. Treating multiple sites in one visit, common with knee protocols that inject at more than one point, extends soreness compared with a single-site injection. Age and baseline joint condition also play a role. An older joint with more existing wear typically takes longer to settle than a younger, healthier one. Ignoring activity restrictions in the first 48 hours, going back to heavy training or a full workday on a treated knee, is the single most common reason recovery drags past the typical window. A patient who resumes running or heavy lifting on day two, rather than easing back in over the first week, tends to reignite the same swelling the injection just settled, which resets the clock on soreness rather than shortening it.
Swelling typically peaks in the first 24 to 48 hours after the injection, then eases steadily from there. A knee that looks or feels more swollen on day four than it did on day one, rather than following that steady downward trend, is the pattern worth flagging to your provider rather than waiting out.
Recovery across a multi-session course
Most PRP protocols call for two to four sessions spaced two to six weeks apart, and recovery from each session usually gets a little easier as your body adjusts. Track how each session’s soreness compares with the last one. A recovery that gets noticeably worse with each round, rather than staying steady or easing, is worth mentioning to your provider before the next session.
Returning to exercise and normal activity
How quickly you return to full activity depends on what that activity demands of the treated area. Walking and light daily movement are usually fine within a day for most sites. Running, weightlifting, or any activity that loads a treated knee or shoulder directly is typically held off for a week or so, though your provider’s specific guidance should override any general range here since it accounts for your exact injection site and volume. Scalp and facial injections rarely restrict exercise itself, though sweating heavily onto a fresh injection site is usually discouraged for the first day.
Before you schedule
Ask your provider how many sessions they recommend and how recovery compounds across a course, since knee and hair-loss protocols often involve three or more sessions spaced weeks apart. Compare that total cost against a single-session estimate before you commit to the full plan.
Frequently asked questions
How long is the recovery time after a PRP injection?
PRP recovery is same-day for nearly everyone. Most people resume normal activity right after the injection, with soreness at the site for one to a few days. PRP does not require surgery, anesthesia, or a hospital stay.
What are the side effects of a PRP injection?
The most common side effects are injection-site pain, bruising, and temporary swelling or redness, and these typically fade within a day or two. Serious risks are rare because PRP uses your own blood rather than a donor product, but infection is possible if the injection is not handled cleanly.
How long does knee PRP recovery take?
Knee PRP recovery is usually a few days of soreness and mild swelling, with clinics commonly recommending lighter activity or reduced weight-bearing for the first one to two days. Full activity typically resumes within a week.
How long does PRP for the face or under-eye area take to heal?
Facial and under-eye PRP recovery is typically the shortest of the common sites, with redness and mild swelling settling within one to three days. Makeup is usually avoidable for the first day to reduce infection risk at the injection points.
Is PRP injection recovery painful?
Most people describe PRP recovery as mildly uncomfortable rather than painful, similar to a bruise or a flu-shot ache at the site. Joint injections, particularly the knee and shoulder, tend to produce more noticeable soreness than facial or scalp injections.
When should I call a doctor after a PRP injection?
Call promptly if you notice spreading redness, increasing warmth, fever, or pain that worsens rather than improves after the first two to three days. These can signal infection, which is rare with PRP but not impossible.
Medical disclaimer. Medical Frontier is an independent educational resource. This page is for general information only and is not medical advice, diagnosis, or treatment, and does not create a doctor–patient relationship. Most regenerative therapies discussed here are not FDA-approved for the uses described and may be offered under limited exemptions or in clinical trials only. Always consult a licensed physician before making any treatment decision.