Easy bruising happens when small blood vessels just beneath your skin rupture and leak blood into the surrounding tissue, forming the familiar discolored patch. For many people, the cause is straightforward: thinner skin, a common medication, or a minor nutritional gap. But when bruises start appearing without any clear injury, or they show up more often than usual, it’s worth understanding what your body might be telling you.
How Bruises Actually Form
Your skin is full of tiny blood vessels called capillaries. When something damages them, even minor bumps you don’t notice, they break open and blood pools beneath the surface. Your body sends clotting proteins and platelets to seal the leak, then gradually reabsorbs the trapped blood over the next one to three weeks. That cleanup process is what causes the color shift from purple to green to yellow.
Several layers of defense normally prevent this from happening too easily. Collagen gives your skin and blood vessel walls their strength. Platelets rush to form a plug at the site of any break. Clotting proteins create a mesh that reinforces that plug. When any part of this system weakens, bruises form more readily and from less force.
Medications and Supplements That Increase Bruising
This is the most common and most overlooked cause. Aspirin, ibuprofen (Motrin), and naproxen (Aleve) all interfere with how your platelets clump together to seal broken vessels. If you take any of these regularly, even at low doses, you’re reducing your body’s first line of defense against bruising. Prescription blood thinners have an even stronger effect.
Certain supplements also play a role. Garlic and hawthorn supplements are strongly associated with increased bleeding risk on their own. If you’re already on a blood thinner, the list grows longer: ginkgo biloba, turmeric, chamomile, melatonin, fenugreek, and milk thistle have all been linked to added bleeding risk when combined with anticoagulant medications. Interestingly, fish oil, ginseng, and saw palmetto do not appear to increase bleeding despite their reputation.
Corticosteroids, whether taken as pills or applied as creams over long periods, thin the skin itself and make vessels more vulnerable to rupture. If you’ve been using a steroid cream on the same area for months, that skin will bruise more easily than the rest of your body.
Aging and Sun Damage
If you’re over 60 and noticing more bruises on your forearms and hands, there’s a specific reason. The connective tissue in your skin breaks down over time, especially in areas that have had years of sun exposure. This condition, sometimes called senile purpura, happens because the layer of tissue that cushions and supports your blood vessels becomes thin and atrophic. Vessels that were once protected by a thick layer of collagen and fat are now closer to the surface and far more fragile.
These bruises tend to be flat, dark purple, and concentrated on the backs of the hands and forearms. They’re not dangerous on their own, but they can look alarming. The thinning is permanent, though protecting your skin from further sun damage and physical trauma can slow the progression.
Nutritional Deficiencies
Vitamin C is essential for building collagen, the protein that keeps your blood vessel walls strong. When your intake drops too low, those walls weaken and blood leaks out more easily. This doesn’t require severe scurvy. Even a modest, prolonged deficit can make you bruise more than usual. UK clinical guidelines actually recommend a trial of vitamin C supplementation before further investigation if someone has a restricted diet and increased bruising as their main symptom.
Vitamin K plays a different but equally important role. Your liver needs it to produce several of the proteins involved in blood clotting. A deficiency can cause bleeding into the skin, nosebleeds, and prolonged bleeding from wounds. Vitamin K deficiency is less common in adults who eat a varied diet, but it can develop in people with digestive conditions that impair fat absorption, since vitamin K is a fat-soluble vitamin.
Liver Disease and Clotting Problems
Your liver manufactures nearly all of the proteins your blood needs to clot. When liver function declines, whether from alcohol use, fatty liver disease, hepatitis, or other causes, it produces fewer of these clotting factors. Chronic liver disease reduces levels of multiple clotting proteins simultaneously, creating a broad disruption in your ability to stop bleeding.
On top of that, liver disease frequently lowers platelet counts. Up to 76% of people with cirrhosis develop at least mild to moderate reductions in platelets. The combination of fewer clotting proteins and fewer platelets means bruises form easily and heal slowly. Other signs of liver-related clotting problems can include bleeding gums, nosebleeds, and tiny red dots on the skin called petechiae.
Low Platelet Counts
Platelets are the cells that form the initial plug when a blood vessel breaks. A normal count ranges from about 150,000 to 400,000 per microliter of blood. When counts drop into the 20,000 to 50,000 range, you may notice easy bruising, small red or purple dots on the skin, and prolonged bleeding from even minor cuts. Below 10,000 is considered a medical emergency because of the risk of spontaneous internal bleeding.
Many things can lower platelet counts: viral infections, autoimmune conditions, certain medications, heavy alcohol use, and bone marrow disorders. A simple blood test (a complete blood count) can identify whether your platelets are low, making it one of the first things checked when someone reports unexplained bruising.
Von Willebrand Disease
This is the most common inherited bleeding disorder, and many people who have it don’t know. Von Willebrand disease affects a protein in your blood that helps platelets stick together and supports the clotting process. Without enough of this protein, or if it doesn’t function properly, bruising becomes frequent and wounds bleed longer than expected.
Diagnosing it isn’t always straightforward. Standard screening blood tests are often completely normal in people with the condition, especially mild cases. Specific tests that measure the amount and function of the von Willebrand factor are needed. If you’ve had easy bruising your whole life, heavy periods since your teenage years, or family members with similar bleeding tendencies, this is worth investigating.
When Bruising Signals Something Serious
Not all bruises are equal. Certain patterns suggest a problem that needs medical attention rather than simple monitoring. Bruises that raise concern tend to share specific features:
- Location: Bruises on the trunk, back, face, ears, or neck are less likely to come from accidental bumps and more likely to reflect either a bleeding disorder or another underlying cause.
- Size and number: Having more than five bruises at once, or bruises larger than about one centimeter that you can’t explain with a specific injury, is considered clinically significant.
- Spontaneity: Bruises that appear without any trauma at all, especially if they’re persistent or keep recurring in the same area, warrant investigation.
Other warning signs to pay attention to alongside bruising include nosebleeds that are hard to stop, unusually heavy menstrual periods, bleeding gums, blood in your urine or stool, and prolonged bleeding after dental work or minor surgery. A combination of easy bruising with any of these symptoms points toward a systemic clotting issue rather than simple skin fragility.
What to Expect During Evaluation
If you bring easy bruising to your doctor, the workup typically starts with a complete blood count to check your platelet levels and a look at your liver and kidney function. Basic clotting tests measure how quickly your blood forms a clot. These initial tests catch the most common causes.
If those come back normal but your symptoms are significant, more specialized tests can measure specific clotting factors, including the von Willebrand factor. Your doctor will also review your medications and supplements carefully, since these are responsible for a large share of easy bruising cases. For people whose only symptom is a minor increase in bruising after starting aspirin or a similar medication, that side effect alone usually doesn’t require a specialist referral.