Bacterial infection is the usual cause of an abscess in the brain of an otherwise healthy person. Fungal brain abscesses tend to occur in those with weakened immune systems. The infection will cause your brain to swell from the collection of pus and dead cells that form.
A brain abscess forms when fungi, viruses, or bacteria reach your brain through a wound in your head or an infection somewhere else in your body. According to the Children’s Hospital of Wisconsin, infections from other parts of the body account for between 20 and 50 percent of all brain abscess cases. Heart and lung infections are among the most common causes of brain abscesses. However, brain abscesses can also begin from an ear or sinus infection, or even an abscessed tooth.
See your doctor right away if you have a brain abscess. You’ll need the appropriate treatment to prevent any brain damage from the swelling.
Nearly anyone can get a brain abscess, but certain groups of people are at a higher risk than others. Some diseases, disorders, and conditions that raise your risk include:
- a compromised immune system due to HIV or AIDS
- cancer and other chronic illnesses
- congenital heart disease
- major head injury or skull fracture
- immunosuppressant drugs, such as those used in chemotherapy
- chronic sinus or middle ear infections
Certain birth defects allow infections to reach the brain more easily through the teeth and intestines. One example of this is tetralogy of Fallot, which is a heart defect.
Symptoms usually develop slowly over several weeks, but they can also come on suddenly sometimes. Symptoms you should watch for are:
- differences in mental processes, such as increased confusion, decreased responsiveness, and irritability
- decreased speech
- decreased sensation
- decreased movement due to loss of muscle function
- changes in vision
- changes in personality or behavior
In babies and young children, most of the symptoms are similar. However, your child may show other symptoms of a brain abscess. The soft spot on top of your baby’s head, called the fontanelle, may be swollen or bulging. Other symptoms in your child can include:
- projectile vomiting
- high-pitched crying
- spasticity in the limbs
Many of these symptoms closely resemble other diseases or health problems. Talk to your doctor immediately if you develop any of the symptoms. You’ll likely need a neurological exam. This exam can reveal any increased pressure within the brain, which can occur from swelling. CT and MRI scans can also be used to diagnose a brain abscess.
In some cases, your doctor may need to perform a lumbar puncture, or spinal tap. This involves the removal of a small amount of cerebral spinal fluid to test for any problems other than an infection. A lumbar puncture will not be performed if any brain swelling is suspected. This is to avoid the risk of brain hematoma or a ruptured blood vessel in the brain.
A brain abscess is a serious medical situation. A stay in the hospital will be required. Pressure due to swelling in the brain can cause reduced blood flow, which can lead to permanent brain damage.
If your abscess is deep inside your brain or it’s 2.5 centimeters or less, it will probably be treated with antibiotics. Antibiotic medications will also be used to treat any underlying infections. Broad-spectrum antibiotics that kill a variety of different bacteria are the most commonly prescribed. You may need more than one type of antibiotic.
Surgery is often the next step if an abscess doesn’t get smaller with the use of antibiotics. It may also be the preferred treatment for abscesses greater than 2.5 centimeters wide. Surgically removing an abscess usually involves opening the skull and draining the abscess. The fluid that’s removed is normally sent to labs to determine the cause of the infection. Knowing the cause of the infection will help your doctor find the most effective antibiotics.
Surgery must be performed in the most severe cases when the abscess causes a dangerous buildup of pressure in the brain. Your doctor may recommend surgery as the best option in the following cases:
- Your brain abscess is at risk of rupturing inside of the skull.
- Your brain abscess contains gasses sometimes produced by bacteria.
A brain abscess is a serious medical condition. Prevention is important. You can lower your risk by monitoring any conditions that may result in a brain abscess. Call your doctor at the first sign of a brain abscess.
If you have any type of heart disorder, talk with your doctor before having any dental or urological procedures. Your doctor can prescribe antibiotics for you to take before these procedures. This will reduce your risk of an infection that could spread to your brain.