Educational guide · not medical advice · read the disclaimer · in an emergency call 911
Hematospermia.com

Blood in semen · Hematospermia

Saw blood in your semen? Take a breath.

It's alarming, but it is usually not a sign of anything serious, and it often clears up on its own. Here's a calm, plain-English guide to what causes it, when to get checked, and what a doctor will do, with every page linked to its medical sources.

Should I worry? ChecklistStart with the basics
Illustration of a relaxed man reading on a tablet on his sofa at home, looking calm.

The short version

  • Most cases are benign and self-limiting, especially under 40 [sources].
  • Recent vasectomy or prostate biopsy is a common, expected cause.
  • Still mention it to a healthcare professional. NHS and Mayo Clinic both advise getting checked.
  • Get seen sooner if you're 40+, it keeps happening, or there's pain, fever or blood in your urine.

The guide

Find your situation

Most people arrive here with one specific question. Pick the one closest to yours.

Start hereWhat is hematospermia?What it looks like, how common it is, and why it happens.CausesWhat causes blood in semenFrom a burst blood vessel to infection, procedures and rarer causes.After a procedureBlood in semen after a vasectomyWhy it happens, how long it can last, and when to call.After a procedureAfter a prostate biopsyCommon and expected for weeks after a biopsy.Age mattersUnder 40 vs 40 and overWhy doctors check older men more thoroughly.Next stepsWhen to see a doctorSame-day warning signs versus a routine appointment.DiagnosisTests your doctor may orderUrine tests, STI tests, PSA, exams and imaging.TreatmentHow it is treatedOften no treatment at all; otherwise treating the cause.Related symptomsPain, urine, color changesBlood in urine too, painful ejaculation, brown semen and more.

What the evidence says

Reassuring, but worth a check

Usually benignMayo Clinic, Cleveland Clinic and the NHS all describe blood in semen as usually not serious.
Most often age 30–40Cleveland Clinic and a 2020 review note it is most common in this age range.
Often no cause foundA review in PubMed Central reports that roughly 30–70% of cases are idiopathic (no cause identified).
3–4 weeksMayo Clinic advises calling a professional if it lasts longer than 3 to 4 weeks or keeps coming back.

Sources: Mayo Clinic, Cleveland Clinic, NHS, PubMed Central reviews. These figures describe groups of people, not you. Only a clinician who examines you can tell you what's going on.

Why this site exists

Illustration of a man talking calmly with a clinician across a desk in a bright consulting room.
Our aim: help you walk into an appointment informed, not frightened.

Search results for "blood in semen" swing between one-line reassurance and frightening forum threads. We wanted one calm, complete place that explains what medical sources actually say, in plain English, organised around the questions people really ask: Is it dangerous? Is it because of my vasectomy? Do I need to see a doctor, and how soon?

Every page links to the guidelines and reviews it is based on, including the NHS, Mayo Clinic, Cleveland Clinic, NICE Clinical Knowledge Summaries, American Family Physician and peer-reviewed reviews on PubMed Central. Read our editorial policy to see how we write and update pages.

Not a substitute for a doctor

This site is educational. It can help you understand your options and prepare for an appointment, but it cannot examine you or diagnose you. If you have severe pain, can't pass urine, have a high fever, or feel very unwell, get urgent medical care.