You don’t remember bumping into anything, but lately you keep noticing new bruises. You’re starting to wonder, “Where did they come from?”

Easy bruising is usually a harmless symptom, not a diagnosis. It can result from normal aging, minor bumps you don’t register, or low vitamin levels. But occasionally it’s a sign of something more serious, especially if bruising starts suddenly, gets worse, or comes with other symptoms.

Below, you’ll find the most common causes of easy bruising, how to tell them apart, and the warning signs that mean it’s time to talk to a doctor.

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What Is Easy Bruising?

A bruise forms when a bump or injury breaks small blood vessels under your skin, letting blood leak into the surrounding tissue. On light skin, bruises usually start purple or red, then fade to green, yellow, or brown as they heal. On darker skin, bruises tend to look purple, black, or dark brown.

Everyone bruises sometimes. But your bruising may count as easy bruising in the following situations:

• You have bruises but don’t remember bumping into anything.
• Marks show up in unusual spots, like your back, chest, abdomen, or face.
• A bruise looks much bigger and more painful than the bump that caused it.
• A bruise lasts longer than expected, especially if it is large, keeps getting worse, or appears without a clear cause.
• Nosebleeds, bleeding gums, or heavy periods show up alongside the bruising.

If several of these sound familiar, it may be due to the following causes.

Getting older is the most common cause of easy bruising. As you age, your skin gets thinner and loses some of the fatty layer cushioning your blood vessels. Blood vessels also become more fragile, and together, these changes mean even a small bump can leave a noticeable bruise.

Age-related bruising usually isn’t a sign of a serious health problem. But if your bruises are unusually large, painful, or showing up in places you wouldn’t expect, it’s a good idea to mention that to your doctor.

Certain medications and supplements make it harder for your blood to clot, which raises your risk of bruising. Common culprits include:

• Blood thinners like warfarin, heparin, and apixaban
• Aspirin, ibuprofen, and naproxen
• Antiplatelet drugs like clopidogrel
• Selective serotonin reuptake inhibitors (SSRIs), a class of antidepressants
• Certain antibiotics
• Supplements like fish oil, ginkgo biloba, and garlic

Steroids like prednisone can cause bruising by thinning your skin, making the blood vessels underneath prone to injury.

If you notice new or worsening bruising after starting a medication, don’t stop taking it on your own. Talk to your doctor first. They can tell you whether the bruising is expected or whether your treatment plan needs adjusting.

Certain vitamins keep your blood vessels strong and help your blood clot normally. Low levels of any of these can make bruising more likely.

• Vitamin C helps build collagen, the protein that gives your blood vessels their structure. Vitamin C deficiency is rare, but when it happens, your vessels weaken and bruise more easily.
• Vitamin K helps your blood clot. Without enough of it, small injuries can bleed longer under your skin, leading to bigger or more frequent bruises.
• Vitamin B12 helps your body make healthy blood cells. A severe deficiency can sometimes lower your platelet count, which may make bruising or bleeding more likely.

Blood tests can check for some vitamin deficiencies, such as low vitamin B12. Vitamin K deficiency is usually evaluated using your symptoms, medical history, and blood-clotting tests. Once your doctor identifies the cause, most deficiencies are easy to correct with diet or supplements.

Your liver makes proteins that your blood needs to clot. Liver disease, such as cirrhosis from heavy alcohol use, can disrupt this process and cause bruising. Watch for yellowing of your skin or eyes, dark urine, or ongoing fatigue alongside the bruising.

In advanced kidney disease, waste products can build up in the blood and interfere with how well platelets work. This can make bruising and bleeding more likely. Some people with kidney disease also take blood-thinning medicines, which can increase the risk further.

If you bruise easily and also feel unusually tired, notice leg swelling, or have changes in your urine (such as foamy urine), mention it to your doctor.

Immune thrombocytopenia (ITP) is a rare condition where your immune system destroys the blood cells responsible for clotting, called platelets. Fewer platelets means even minor bumps can cause noticeable bruises, sometimes with no clear cause at all.

Other symptoms pointing to ITP include:

• Petechiae (tiny red or purple dots on the skin)
• Purpura (larger purple or brown patches on the skin)
• Bleeding gums
• Blood in your urine or stool
• Heavy periods
• Frequent nosebleeds
• Fatigue

To diagnose ITP, doctors rule out other causes of a low platelet count. It is diagnosed in about 3.3 in 100,000 adults every year, making it rare but one of the more recognized causes of unexplained bruising.

Easy bruising sometimes runs in the family. Some people simply have more fragile blood vessels, with no underlying disorder involved.

Other times, it’s a diagnosed condition. The most common inherited bleeding disorder, von Willebrand disease, affects a protein that helps platelets stick together. Hemophilia lowers levels of specific clotting factors. Ehlers-Danlos syndrome weakens the connective tissue that supports your blood vessels, making bruising more likely.

These conditions vary in how common they are. Some inherited bleeding disorders cause symptoms in childhood, while milder cases may not be recognized until adulthood.

Vasculitis happens when your blood vessels become inflamed. This can weaken vessel walls and lead to purpura, or purple and reddish patches under your skin.

Vasculitis is rare and can affect organs beyond your skin. See a doctor if you develop fever or joint pain in addition to the easy bruising.

Rarely, easy bruising can be a sign of blood cancer, such as leukemia. These conditions can lower your platelet count or affect how well your blood clots.

Bruising from blood cancer usually comes with other symptoms. Watch for ongoing fatigue, unexplained weight loss, frequent infections, or swollen lymph nodes.

How Doctors Diagnose the Cause of Easy Bruising

Diagnosing easy bruising starts with your medical history, followed by a review of your medications and supplements. Your doctor will also do a physical exam. From there, they’ll order some blood tests to get a diagnosis.

Common tests to expect include:

• A complete blood count, which includes your platelet level
• A peripheral blood smear, which checks the shape and health of your blood cells
• A fibrinogen test, which measures a protein your body needs to form blood clots
• Clotting tests, which measure how well and how fast your blood forms clots

If the results point to a problem, your doctor may order additional testing to find the exact cause. For example, if they suspect:

• A bleeding disorder — They may order special blood tests, such as tests for von Willebrand disease or specific clotting factors. Imaging tests may be needed if your doctor suspects internal bleeding or another complication.
• A bone marrow disorder — They may do a bone marrow biopsy.
• A vitamin deficiency, vasculitis, or another condition — They may order additional blood tests.

Tips To Reduce Easy Bruising

Most bruises heal on their own within about two to three weeks, although some can take longer. While you wait, a few simple steps can speed up healing and lower your risk of new bruises.

To help a bruise heal faster:

• Ice it for the first 24 to 48 hours. Wrap the ice pack first and limit sessions to 15 minutes.
• Rest and raise the area above your heart to ease swelling.
• Switch to a warm compress after the first two days.
• Take acetaminophen for pain. Ask your doctor before using aspirin or ibuprofen, since these can make bruising worse.

To lower your risk of getting new bruises:

• Clear walkways of clutter, cords, and loose rugs.
• Use good lighting or a night-light in dim rooms.
• Wear protective gear during contact sports.
• Eat a balanced diet with enough vitamins and minerals.
• Keep up with regular monitoring appointments if you take blood thinners.

Remember that bruising is a symptom, and when it’s due to an underlying medical condition, treating that condition may be the only solution. Your doctor will help you find the best treatment for your case.

When To See a Doctor Right Away

Here are warning signs that your easy bruising needs prompt medical attention.

• Frequent bleeding, like unexplained nosebleeds, bleeding gums, or blood in your stool or urine
• Petechiae, clusters of tiny red or purple dots under your skin
• A hematoma, a large lump that’s hard, growing fast, or very painful
• Trunk bruising, large bruises on your chest, back, or belly, with no injury
• Signs of illness, like sudden fever, chills, or extreme fatigue, along with bruising
• New or severe bruising right after starting a new medication
• A family history of bleeding or clotting disorders

If you notice any of these, don’t wait it out. Book an appointment and let your doctor investigate the cause.