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What changed
Much less fluid, no fluid at all, or the sensation without the fluid. It is alarming the first time and, for the most common cause, mechanically harmless and reversible. It becomes a different question when fertility matters or when it arrived with pain or blood.
How common: Common in anyone taking a medicine for an enlarged prostate, and common after prostate surgery, where it is expected. Volume also declines gradually with age.
See someone about this if
This page narrows the question; it does not answer it. Everything below is written so that you can walk into an appointment with a date, a pattern, and a specific thing to ask — which is the difference between a consultation that goes somewhere and one that does not.
That is by far the most likely explanation, and for that class it is a mechanical, harmless, reversible effect rather than a sign of damage.
Check your medicinesThat is the classic sign of retrograde ejaculation — semen going backwards into the bladder. Harmless in itself, but relevant if conception is a goal.
Then this stops being a cosmetic question and becomes a fertility one, and it is worth raising early rather than after months of trying.
Care-first checklist4 classes of commonly prescribed medicine are associated with a change in ejaculation. Associated does not mean responsible in your case, and it never means stop taking anything — this is a list of things worth raising with whoever prescribed them.
4 conditions on this site list a change in ejaculation among their effects. A condition appearing here is not a suggestion that you have it — it is a list of things a clinician can rule in or out, several of which are a single blood test away.
The most common identifiable cause and usually the most obvious by timing.
Where the mechanics have been changed permanently or semi-permanently.
Less common, and worth ruling out when nothing else fits.
Take these to an appointment
Matters more if: trying to conceive.
Much less fluid, no fluid at all, or the sensation without the fluid. It is alarming the first time and, for the most common cause, mechanically harmless and reversible. It becomes a different question when fertility matters or when it arrived with pain or blood. The causes worth ruling out fall into a few groups: medicines, surgery and anatomy, medical causes, and medicines. Most people turn out to have more than one contributing at once.
Common in anyone taking a medicine for an enlarged prostate, and common after prostate surgery, where it is expected. Volume also declines gradually with age.
Yes — 4 classes of commonly prescribed medicine are associated with it, most frequently alpha-blockers for the prostate. Never stop, pause, or change a prescribed medicine because of that; take the observation and the date it started to the person who prescribed it, who can weigh a review against what the medicine is doing for you.
Sooner than most people do. Specifically and without waiting: Blood in semen needs assessment — usually harmless, but not something to assume about.
If it started with a prostate medicine, knowing the effect is mechanical and reversible removes most of the alarm attached to it. Orgasm sensation is usually preserved even when volume is not; those are two separate things. Raise fertility plans before starting a medicine rather than after — the options are wider that way.
Educational information about why a symptom happens — not a diagnosis, and not a way to work out what is wrong with you. Most of these changes have more than one cause at once, and the causes on this page overlap. Nothing here can examine you, look at your history, or run a test. Pain, bleeding, a lump, or a symptom that is new and unexplained always deserves assessment.