Did You Bump Your Head? What You Need to Know About Subdural Hematoma

When you bump your head, you might brush it off as a simple bruise or a minor inconvenience. However, head injuries can sometimes cause hidden dangers beneath the skull that require urgent medical attention. If you or a loved one develops a persistent headache, vomiting, or trouble speaking days after a fall, you should never ignore it.

These signs can point to a serious medical condition affecting your brain. Today, we will explore subdural hematoma in clear, simple terms so you understand what it is, how it happens, and what steps you must take to stay safe.

Simply Put, What Is a Subdural Hematoma?

To understand a subdural hematoma, you first need to look at how your brain is protected inside your head. Your brain is a very soft and delicate organ. Because it is so precious, your body encases it inside your hard skull. Between your skull and your brain, there are protective layers of tissue called membranes.

When you experience a blow to the head, tiny blood vessels running through these membranes can tear. A subdural hematoma happens when blood leaks out of these torn vessels and pools underneath the outer protective membrane, which doctors call the dura mater, but right on top of your brain tissue.

The bleeding does not happen inside the actual brain tissue itself, but rather in the space surrounding the brain. The real danger begins because your skull is a rigid, closed box. As more blood pools into that space, it takes up room and presses heavily against your soft brain.

This growing pressure is what makes the condition so dangerous. If the pressure keeps rising, it can damage brain cells, cause you to lose consciousness, or even put your life at serious risk if left untreated.

How Does It Differ from an Epidural Hematoma?

You might wonder if all head bleeds are the same. While both subdural and epidural hematomas involve bleeding inside the head, they happen in different locations and behave differently.

In an epidural hematoma, blood pools on top of the dura membrane, pressing directly against the inner wall of your skull. This type usually results from a severe, high-impact blow. The symptoms of an epidural hematoma tend to appear very quickly, often within minutes or hours.

On the other hand, a subdural hematoma occurs underneath the dura membrane. It is much more common than an epidural hematoma. Also, the bleeding in a subdural hematoma can happen very slowly over days or weeks, making it tricky to spot at first.

The Three Main Types of Bleeding

Doctors classify subdural hematomas into three main types based on how fast the bleeding occurs and when symptoms show up. Knowing these types helps your medical team choose the right treatment.

Symptoms to Watch Out For

The signs of a subdural hematoma depend greatly on how fast the blood is accumulating inside your head. If you suffered an acute injury, you might pass out right away. If the bleeding is chronic, you might feel fine for weeks before subtle changes start creeping in.

You should monitor yourself or your loved ones closely for these important warning signs after any head impact:

• A severe headache that does not go away and keeps getting worse over time.
• Feeling confused, foggy, or noticing sudden changes in your personality or behavior.
• Frequent nausea and repeated vomiting without an obvious stomach bug.
• Heavy drowsiness, extreme fatigue, or trouble waking up from sleep.
• Weakness, numbness, or a heavy feeling in one arm or leg, often on the side opposite your head injury.
• The black centers of your eyes (pupils) changing size so that one looks larger than the other.
• Slurred speech, trouble finding the right words, or difficulty understanding others when they speak.
• Sudden memory lapses or forgetting recent conversations and events.
• Seizures or sudden shaking spells that look like epilepsy.
• Blurry vision, double vision, or other sudden changes in how well you can see.

Causes and Risk Factors

The primary root cause of a subdural hematoma is physical trauma to the head. When your head experiences a sudden jolt, blow, or stop, your brain shifts inside your skull. This movement stretches and tears the delicate bridging veins.

Common triggers for this kind of head trauma include:

• Accidental falls around the home, which are especially common among older adults.
• High-speed motor vehicle crashes involving cars, motorcycles, or bicycles.
• Physical assaults or violent blows to the head.
• Contact sports such as boxing, football, rugby, or ice hockey.

While anyone can experience head trauma, certain groups face a much higher risk of developing a subdural hematoma:

• Older Adults: As you age, your brain shrinks slightly inside your skull. This natural shrinkage stretches your veins, making them fragile and prone to tearing even from a minor bump.
• People Taking Blood Thinners: If you take medicines like warfarin, aspirin, or other blood thinners to prevent blood clots, your body cannot stop bleeding easily. Even a tiny bump can lead to a large and dangerous pool of blood.
• Heavy Alcohol Users: Regular and heavy alcohol consumption can cause the brain to shrink over time. It also increases your chances of falling and injuring your head.
• Infants and Young Children: Severe shaking or physical abuse, known as shaken baby syndrome, can tear infant brain vessels and cause life-threatening bleeding.

How Doctors Diagnose It

When you arrive at the hospital emergency department after a head injury, doctors need to act quickly. They will start by performing a thorough physical and neurological exam. They will check your reflexes, balance, eye movements, and mental alertness.

To confirm whether you have a subdural hematoma, your doctor will order imaging tests:

• CT Scan: A computed tomography scan takes fast X-ray pictures of your head from different angles. It creates a detailed cross-sectional view of your brain. Because CT scans are fast and widely available, they are the main tool doctors use in emergency rooms to spot brain bleeds.
• MRI Scan: A magnetic resonance imaging scan uses powerful magnets and radio waves to generate even more detailed pictures of your brain tissue. Doctors use MRIs when they need to examine smaller or chronic bleeds that might not show up as clearly on a standard CT scan.

Treatment Options

The treatment plan your medical team chooses depends entirely on the size of the bleed, how fast it is growing, your overall health, and the symptoms you feel.

• Observation and Monitoring: If the blood pool is very small and you show no major symptoms, your doctor might decide against surgery right away. Instead, they will admit you to the hospital to monitor your vital signs and perform follow-up brain scans. This ensures the blood is absorbing naturally without pressing further on your brain.
• Surgical Intervention: If the hematoma is large or putting dangerous pressure on your brain tissue, you will need surgery to remove the blood. Neurosurgeons use two main surgical techniques depending on the situation.
• Burr Hole Trephination: During this procedure, the surgeon drills a tiny hole into your skull directly over the pooled blood. They insert a small rubber tube through the hole to flush out and suction away the liquid blood.
• Craniotomy: For large blood clots or thick blood that cannot drain through a small hole, the surgeon performs a craniotomy. They temporarily remove a larger section of your skull bone to access the brain, clean out all the pooled blood, and then secure the bone back into place.

Deciding whether you need surgery or can heal with close monitoring is a complex medical choice. Only qualified neurosurgeons and emergency doctors can make this assessment. Never attempt to manage a head injury at home if you suspect bleeding.

How to Prevent Subdural Hematoma

While you cannot prevent every accident in life, you can take practical steps to lower your risk of severe head injuries:

• Always wear an approved helmet whenever you ride a bicycle, motorcycle, skateboard, or scooter.
• Fasten your seatbelt securely every single time you ride in a car, truck, or van.
• Make your home safer by removing tripping hazards such as loose rugs, clutter, and poor lighting, especially if you are an older adult. Install grab bars in your bathroom.
• Moderate your alcohol intake to maintain good balance, coordination, and judgment.
• If you take blood thinners, talk to your doctor regularly about your bleeding risks, and take extra precautions to avoid falls.