Hematoma After a Vasectomy: What It Looks Like and When to Call

You’re swollen and bruised, and somewhere you read the word hematoma. It means blood has pooled in the tissue of your scrotum. Typical published rates run from about 1% to 12%, depending on the technique, and most hematomas are small. Dark bruising is expected. Swelling that keeps growing, a lump that keeps getting bigger, or pain that suddenly gets worse is not. If you see any of those, call your surgeon the same day.

The short version

• A hematoma is blood that collects in the scrotum after surgery, usually soon afterward.
• Typical rates run from about 1% to 12%, with incision vasectomy at the high end.
• Dark bruising that spreads is normal and settles within a few weeks.
• Fast-growing swelling, a growing lump, or pain that suddenly worsens means call today.
• Most are minor. A large one that keeps growing may need surgery to drain.

What is a hematoma after a vasectomy?

A hematoma is blood that can’t drain away, so it collects in a space and pushes the surrounding tissue outward. Cleveland Clinic: Hematoma calls it a closed wound where blood fills a space inside the body. A bruise is the small version, blood you can see through the skin.

After a vasectomy the blood often comes from injured veins. The AAFP says bleeding and hematoma, the most common complications of vasectomy, often result from injury to the pampiniform venous plexus, a network of small veins (AAFP: Common Questions About Vasectomy). The scrotum is elastic and compresses bleeding poorly, so blood has room to collect (BMJ Case Reports: Scrotal haematoma following vasectomy). A 2021 review says hematomas appear shortly after surgery (World Journal of Men’s Health: Review of Vasectomy Complications).

How common is a hematoma after a vasectomy?

It depends on the technique and the study:

Surgeon volume matters too. A US national survey cited in the 2021 review found hematomas in 4.6% of men whose surgeon did 1 to 10 vasectomies a year, and 1.6% above 50. A 2025 AAFP review says no-scalpel and other minimally invasive techniques reduce the rates of bleeding and hematoma (AAFP: Vasectomy, Common Questions and Answers), and the scalpel vs. no-scalpel comparison explains what that changes.

Is it a hematoma or normal bruising?

Almost everyone is bruised and swollen. NHS Lothian’s leaflet says bruising may be dark, can appear away from the wound, and may get worse over the first few days before settling within a few weeks (NHS Lothian: Important advice following your vasectomy). The NHS says testicle pain and swelling for around a week is common (NHS: Recovering after a vasectomy).

The test is direction. Normal swelling peaks and fades. A hematoma keeps growing or keeps hurting more.

The right column comes from NHS: Complications of a vasectomy and NHS Lothian, which says rapid swelling could mean active bleeding.

One published case shows what large looks like. A man had swelling and skin discoloration within hours of his vasectomy, a dark red scrotum swollen up toward both groins, and surgeons drained about 500 to 600 mL of blood. He healed well, and the authors call cases that serious scarce (BMJ Case Reports). Most hematomas look nothing like that. A doctor can tell the two apart: hematomas feel different from healthy tissue under a provider’s hands, and ultrasound can help show them (Cleveland Clinic: Hematoma).

How is a hematoma different from a hematocele or a sperm granuloma?

The three get mixed up online, and they are different problems.

The first two definitions come from a Journal of Ultrasound review of scrotal emergencies, which adds that both blood collections get reabsorbed over time. The granuloma definition is Cleveland Clinic’s, which says the lump isn’t dangerous and the body almost always absorbs it. Each has its own page: what is a hematocele and sperm granuloma after vasectomy.

How do doctors treat a hematoma?

Small ones usually get watched. The 2021 review says most hematomas are minor and resolve without treatment, and Cleveland Clinic says smaller hematomas usually need no treatment or only simple home care.

Large ones are the surgeon’s call. The AAFP says that in extreme cases a hematoma can need surgery to control bleeding, open the scrotum and remove the blood. The BMJ case report draws the line at large hematomas that are worsening or not responding to conservative care. Whether to drain one is your surgeon’s decision, made on an exam.

What lowers your risk of a hematoma?

Part of the risk is set before you get in the chair, and the rest is set on your couch.

1. Ask about technique and volume. The AAFP says minimally invasive techniques such as no-scalpel lower hematoma rates, and our questions to ask your urologist list starts with how many vasectomies they do a year.
2. Tell your surgeon about every blood thinner, medicine and supplement you take. Cleveland Clinic: Vasectomy says providers ask about these and about any history of excessive bleeding or blood disorders. Follow their instructions on what to pause.
3. Rest for the first 24 to 48 hours, reclined as much as you can. NHS Lothian says this takes pressure off the scrotum and lowers the risk of bruising and swelling. The day 1 guide goes through those hours.
4. Wear snug support. NHS 111 Wales: Vasectomy says tight-fitting underwear or athletic support day and night for the first few days. The 2021 review says support while you’re active can reduce the risk of delayed bleeding.
5. Ice with fabric between the pack and your skin. NHS Lothian suggests an ice pack wrapped in a thin towel, never on bare skin. The icing schedule has the on-and-off rhythm.
6. Skip heavy lifting and sport. NHS 111 Wales says at least a week, the NHS says usually 1 to 2 weeks, and Cleveland Clinic says nothing over 10 pounds. Your surgeon’s number wins. The exercise timeline breaks it down by activity.

Support and ice are standard advice in the NHS and Cleveland Clinic sources above, and we make products for those two jobs. Our recovery jockstrap is purpose-built for vasectomy recovery and holds an ice pack in place, and Nutsicle ice packs are shaped to fit its pocket. One customer wrote that, lying there swollen and bruised, our recovery briefs were the one thing making it better. That’s one man’s experience. We don’t claim any product changes your odds of a hematoma, and your surgeon’s rules come first. The jockstrap vs. briefs guide covers which to pick.

When should you call your doctor?

Call your surgeon the same day for:

• Swelling that grows over hours, or a lump inside the scrotum that keeps getting bigger.
• Pain and swelling that suddenly get worse, or show no sign of easing after a few days.
• Heavy bleeding around the stitches, or blood, pus or fluid leaking from the wound.
• Fever, chills or a high temperature.
• Pain that the medicine your surgeon gave you doesn’t control.

Go to an emergency room for rapid swelling of the scrotum, and get immediate medical attention if a swelling or lump is very large. Both come from NHS Lothian’s leaflet. The other items come from the NHS and Cleveland Clinic call lists. If you had surgery recently, your own discharge sheet comes first. It knows your operation. If you need a urologist, find a urologist near you.

FAQ

What does a hematoma look like after a vasectomy? A hematoma looks like swelling that keeps growing or a lump inside the scrotum that keeps getting bigger, sometimes with dark skin discoloration. In one published case the swelling was large, dark red and reached toward the groin. Dark bruising alone is common and expected. A doctor can tell the difference by touch and, if needed, ultrasound.

How long does a hematoma last after a vasectomy? None of the sources we read gives one timeline, and it varies with size. A 2021 review says most hematomas are minor and can resolve without treatment, and NHS Lothian says normal bruising settles within a few weeks. If swelling shows no sign of easing after a few days, the NHS says to get urgent advice.

Do you need surgery for a hematoma after a vasectomy? Usually not. A 2021 review says most hematomas are minor and can resolve without treatment, and the AAFP describes surgery as a step for extreme cases. The BMJ case report describes drainage for large hematomas that keep worsening or don’t respond to conservative care. Your surgeon makes that call.

Do painkillers like ibuprofen or aspirin cause a hematoma after a vasectomy? None of the NHS or Cleveland Clinic pages we cite says ibuprofen causes one. The NHS says a painkiller such as ibuprofen or paracetamol should help, and NHS Lothian’s leaflet advises taking both regularly for the first 48 to 72 hours. A Blackpool Teaching Hospitals leaflet says aspirin isn’t recommended because it can prolong bleeding. Tell your surgeon about every blood thinner and supplement you take, and follow their instructions.

Is a hematoma after a vasectomy an emergency? Rapid swelling or a very large swollen scrotum is. NHS Lothian’s leaflet advises going to A&E for rapid swelling and seeking immediate care when a swelling or lump is very large. Slower changes, like swelling that isn’t easing after a few days, still deserve a same-day call to your surgeon.

Sources

• AAFP: Common Questions About Vasectomy (2013)
• AAFP: Vasectomy, Common Questions and Answers (2025)
• World Journal of Men’s Health: Review of Vasectomy Complications (2021)
• BMJ Case Reports: Scrotal haematoma following vasectomy (2014)
• Journal of Ultrasound: Ultrasound imaging in scrotal emergencies (2013)
• NHS Lothian: Important advice following your vasectomy
• Blackpool Teaching Hospitals: Advice to patients following a vasectomy
• NHS: Complications of a vasectomy
• NHS: Recovering after a vasectomy
• NHS 111 Wales: Vasectomy
• Cleveland Clinic: Vasectomy
• Cleveland Clinic: Hematoma

Editorial and informational. Not medical advice. Read the full disclaimer.