What is a “PSA bounce?”

I had brachytherapy to treat my prostate cancer and my PSA had dropped to 0.3 ng/ml. But six months ago, my PSA had gone up to 0.5, and now it’s up to 0.8 ng/ml. I’m worried that the cancer is back; my doctor said it could be a “PSA bounce.” What’s that?

William C. DeWolf, M.D., Chief of the Division of Urology at Beth Israel Deaconess Medical Center, answers:

Your concern is understandable. The last thing a prostate cancer patient wants to hear after treatment is that his prostate-specific antigen (PSA) level is on the rise!

However, as your doctor points out, you may be experiencing nothing more than a temporary, benign rise in PSA, a phenomenon often called a PSA bounce, spike, or bump. It’s defined as an increase in PSA of 0.1 to 0.5 ng/ml — or a rise in PSA of 15% or greater over the prebounce level — followed by a quick drop to prebounce levels without treatment.

As many as one-third of men who choose brachytherapy, or seed therapy, to treat their prostate cancer may experience this transient rise in PSA, usually about 18 to 24 months after the seeds are implanted. In one study, approximately 12% of men who underwent treatment with external beam radiation therapy were reported to have a PSA bounce about nine months after treatment, on average.

Doctors aren’t sure what causes a PSA bounce, though several theories exist. Studies have shown an association between recent ejaculation and higher PSA levels, for example, as well as proctitis (inflammation of the rectum) and the insertion of a catheter. Age and radiation dose may play a role as well. There can also be variability among laboratories in determining PSA levels. Another theory is that a patient may be experiencing a late reaction to the radiation, such as radiation prostatitis.

The challenge for clinicians is to determine whether the rising PSA represents a bounce or cancer progression. With radiation, treatment is generally not considered a failure until a patient experiences three consecutive increases in PSA; you’ve had two. Another definition of treatment failure following radiation is an increase of 2 ng/ml over the PSA nadir, or low point, at any time. For you, that would mean a PSA of 2.3 ng/ml.

Not knowing whether your cancer is advancing can certainly be a tremendous source of anxiety. But your physician probably wants to wait to see what your PSA level is in six months, especially since it’s still relatively low. Armed with more information, he or she will be able to make a better recommendation about treatment — or reassure you that the rise in PSA was indeed nothing more than a bump in the road.

SOURCE: Satoh T, Ishiyama H, Matsumoto K, et al. Prostate-Specific Antigen “Bounce” After Permanent 125I-Implant Brachytherapy in Japanese Men: A Multi-Institutional Pooled Analysis. BJU International 2009;103:1064–68. PMID: 19040526.

Originally published September 2009;  last reviewed on March 16, 2011.


  1. Josephine

    After prostatectomy, Hubby PSA was .1 then at 3 months .2. 40 sessions of radiation and was 1.6 urologist did a retest after 1 month then 1.3. Is this a bounce or need further treatment? Should we wait a little longer

  2. Oliviah

    My husband had radical prostatectomy followed by radiation. After radiation the PSA level dropped off eventually to 0 for 2 months. Thereafter it began creeping up: 0.017, 0.02, 0.04, 0.07, 0.13, 0.22, 0.35, 0.56, 1.0, 1.57 and last month’s reading was 2.29. I am concerned with the exponential rise. Could the cancer be coming back?

  3. Art Busse

    7 weeks after RP my first PSA reading was 13. two weeks later it was 26. Prior to surgery PSA was 48 and had been on a 8 year steady incline with a doubling time of 260 days at the time of surgery (4/17). That was a shocking increase when I was expecting a decrease to zero.

    A bone scan before surgery was negative. One two months after surgery was positive.

    Anyone out there heard of this before?

    – Art Busse

  4. Curtis Bale

    I am 74 years old and had the DaVinci procedure done 7 years ago. My PSA initially went to zero after about four years it reappeared at .01. The next year it was .2 and then 2.1the following.
    This past year I had a CT scan and a Bone scan both were negative but my PSA continued to rise to 4.2. I also had a Choline scan done at the Mayo Clinic. This scan showed cancer in the nodes just outside the prostrate bed on both sides.
    I then underwent 28 radiation treatments directed at the highlighted areas. My last treatment was completed this past July 14th. My PSA when I started treatment was 4.2. At my first 90 day test it was 3.9. I just had my 180 day test and it is 5.9. I am very confused about these results. Don’t understand why it would be going up..

  5. Daniel W Barton

    I am 63 yrs. old . I have had 2 seed implant treatments first one was 88 seeds gleason was 3+4 psa 7.1 second treatment was 34 seeds psa went from 2.8 to 7.3 after that treatment psa was 2.8 now a 6 month follow up blood test psa is 7.1 is this a bounce? What can I do. I am seeing the urologist on 7/29/16

  6. Benedict Peterson

    Had RP in 2010 and it failed. Started salvage EBRT in December 2012, completed in march 2013. PSA dropped to 0.1 September 2013,0.1 in march 2014. In October 2014 rose to 0.2.
    Does this mean the cancer has returned ?

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