What Is a Brain Infection?
A brain infection occurs when harmful microorganisms invade the brain or its surrounding tissues. Common conditions include meningitis (infection of the protective membranes), encephalitis (inflammation of brain tissue), transverse myelitis (infection affecting the spinal cord), and cerebral abscess (accumulation of pus within brain tissue). These infections vary in how they affect the nervous system, but all require prompt evaluation to avoid irreversible neurological damage.
Types of Brain Infections
Viral Brain Infection
Viral infections—such as herpes simplex, enteroviruses, and mosquito-borne viruses—are among the most common causes of brain infection encephalitis.
Bacterial Infection in Brain
Bacteria may reach the brain from ear or sinus infections, bloodstream infections, or traumatic injuries. Conditions like bacterial meningitis and cerebral abscess progress quickly and need urgent treatment.
Fungal Infection in Brain
Although rare, fungal infections can severely affect individuals with weakened immune systems. These require long-term antifungal medications and careful monitoring.
Brain Nerve Infection
Some infections spread along nerve pathways, causing inflammation and symptoms related to nerve damage or dysfunction.
What are the symptoms of brain infections?
Brain infection symptoms can appear suddenly and may become severe within a short time. Common signs include intense headache, high fever, and stiffness in the neck. Many patients also experience drowsiness, confusion, nausea, vomiting, or sensitivity to light. As the infection worsens, symptoms such as seizures, difficulty speaking, weakness in the limbs, or changes in behaviour may develop. Any combination of these symptoms should be taken seriously and evaluated by a doctor immediately.
Headache
A persistent or severe headache is one of the earliest signs of a brain infection and often doesn’t improve with usual pain medication.
Fever
A high fever commonly accompanies brain infections as the body tries to fight off the invading organism.
Stiff Neck
Neck stiffness, especially when bending the neck forward, is a classic symptom of infections like meningitis.
Drowsiness
Excessive sleepiness, confusion, or difficulty staying awake may indicate that the infection is affecting brain function.
Others
Other symptoms may include nausea, vomiting, sensitivity to light, seizures, behavioural changes, or difficulty speaking or walking.