A subdural hematoma is a dangerous buildup of blood on the surface of the brain that typically happens after a head injury. This condition is known as a “silent threat” because blood can pool slowly inside the skull without showing any clear https://drarthurchou.com/ warning signs right away. If left untreated, the growing pool of blood presses hard against delicate brain tissue, which can lead to permanent brain damage or death.

This article uses professional journalism standards to break down how this bleeding happens, the main signs to watch for, and how doctors fix it.

To understand a subdural hematoma, it helps to know how the brain is protected inside the skull. Your brain is wrapped in three protective layers of tissue. The toughest, outermost layer is called the dura mater, which sits right beneath the hard bone of the skull.

A subdural hematoma occurs when blood vessels—usually small veins—tear and leak blood into the narrow space between the dura mater and the brain itself. Because the skull is solid bone, it cannot expand. When leaked blood pools in this tight space, it forms a large clot called a hematoma. This clot takes up valuable space, squeezing the brain and cutting off its normal blood flow.

Doctors divide these bleeding events into three distinct types based on how fast the blood builds up:

• Acute Subdural Hematoma: This is the most dangerous type. It causes rapid bleeding immediately after a major head injury, such as a serious car crash or a long fall. Symptoms appear within minutes or hours.
• Subacute Subdural Hematoma: The bleeding happens a bit slower in this type. Symptoms usually take a few days or up to two weeks to become noticeable.
• Chronic Subdural Hematoma: This is the sneakiest type. The bleeding is incredibly slow and can grow over many weeks or even months. It often happens after a very minor bump to the head that a person might forget about completely.

The chronic version of this condition is a major challenge for medical professionals because it hides in plain sight. When a young person hits their head hard, they know they need to see a doctor. However, an elderly individual might bump their head gently on a kitchen cabinet and think nothing of it.

Because the veins leak drop by drop, the brain slowly adapts to the pressure at first. Days turn into weeks, and the pool of blood keeps growing. By the time symptoms finally show up, the pressure inside the skull has reached a critical point.

Even worse, the early warning signs in older adults—like forgetfulness, clumsy walking, or mild confusion—look exactly like normal aging or early dementia. As a result, family members often miss the true danger until a major medical crisis occurs.

As the blood pool grows larger and presses harder on the brain, it disrupts normal brain function. The symptoms depend entirely on which part of the brain is being squeezed.

• Worsening Headaches: A constant, dull ache that keeps getting worse over time and does not go away with normal pain medicine.
• Mental Confusion: Sudden trouble remembering things, difficulty speaking clearly, or acting mixed up and disoriented.
• Balance Problems: Feeling unusually dizzy, clumsy, or having a hard time walking in a straight line.
• Extreme Sleepiness: Feeling exhausted all the time, sleeping for long hours, or being very difficult to wake up.
• Physical Weakness: Experiencing numbness, tingling, or weakness in one arm, leg, or side of the face.
• Vision Changes: Developing blurry vision, double vision, or pupils that are unequal in size.

When a patient arrives at the hospital with a suspected brain bleed, doctors must act with extreme speed to confirm the problem and lower the pressure inside the head.

• Advanced Brain Scans: The primary tool for finding a hematoma is a CT scan or an MRI scan. These imaging tools allow doctors to see the exact size, age, and location of the blood pool.
• Burr Hole Surgery: For slow-growing, chronic hematomas where the blood is liquid, a neurosurgeon will drill tiny holes into the skull. They use these small holes to wash out the blood and relieve the dangerous pressure.
• Craniotomy Surgery: For fast-moving, acute hematomas where the blood has formed a hard clot, major surgery is required. The surgeon temporarily removes a large section of the skull bone to safely remove the clot and stop the active bleeding.
• Medical Management: Patients are given special medications to reduce brain swelling, control blood pressure, and prevent seizures during the recovery phase.

While a severe head injury can cause a brain bleed in anyone, certain groups of people are highly vulnerable to subdural hematomas from even the smallest impacts.