Meningitis: Causes, Symptoms, Treatment, Vaccines and Prevention

Meningitis is inflammation of the meninges, the protective membranes surrounding the brain and spinal cord.

It can be caused by several different infections and, less commonly, non-infectious conditions.

The most important message to remember is this:

Meningitis can be a medical emergency.

Bacterial meningitis is particularly dangerous and can progress rapidly. Anyone with symptoms suggesting meningitis should receive urgent medical assessment rather than waiting to see whether the symptoms disappear.

Early diagnosis and treatment can save lives and reduce the risk of permanent complications.

What Causes Meningitis?

Several different organisms can cause meningitis.

Major infectious causes include:

• bacteria,
• viruses,
• fungi,
• and parasites.

Different organisms spread in different ways and require different treatments.

Rarely, inflammation of the meninges can also occur without an infection.

Possible non-infectious causes include:

• certain medicines,
• autoimmune or inflammatory diseases,
• some cancers,
• and other medical conditions.

What Is Bacterial Meningitis?

Bacterial meningitis occurs when bacteria infect the membranes surrounding the brain and spinal cord.

It is the most dangerous major form of meningitis.

Several bacteria can cause it.

Important causes worldwide include:

• Neisseria meningitidis — meningococcus,
• Streptococcus pneumoniae — pneumococcus,
• Haemophilus influenzae,
• and Streptococcus agalactiae — Group B streptococcus.

The bacteria responsible can vary according to a person's age, location and medical circumstances.

Why Is Bacterial Meningitis So Dangerous?

Bacterial meningitis can progress extremely quickly.

WHO reports that it can become fatal within 24 hours.

Even with appropriate treatment, bacterial meningitis can cause death or permanent complications.

Possible long-term effects include:

• hearing loss,
• seizures,
• weakness or other neurological problems,
• learning or cognitive difficulties,
• vision problems,
• and other disabilities.

Approximately one in five people affected by bacterial meningitis develops long-term complications, according to WHO.

Rapid recognition and treatment are therefore critical.

What Is Meningococcal Disease?

Meningococcus (Neisseria meningitidis) can cause meningitis.

It can also enter the bloodstream and cause severe infection known as meningococcal sepsis or septicaemia.

Someone can have:

• meningitis,
• bloodstream infection,
• or both.

Meningococcal disease can deteriorate very rapidly and requires emergency medical treatment.

What Is Viral Meningitis?

Viral meningitis is caused by viruses and is generally more common than bacterial meningitis.

Many different viruses can cause it, including:

• enteroviruses,
• herpes viruses,
• varicella-zoster virus,
• influenza virus,
• mumps virus,
• measles virus,
• and some mosquito-borne viruses.

Most people with mild viral meningitis recover without specific treatment.

However, viral meningitis can sometimes be serious, particularly in:

• newborn babies,
• people with weakened immune systems,
• and people with certain underlying conditions.

Anyone with symptoms suggesting meningitis should still be medically assessed because symptoms alone cannot reliably distinguish bacterial from viral meningitis.

What Is Fungal Meningitis?

Fungal meningitis is less common than bacterial or viral meningitis.

It is more likely to affect people with weakened immune systems.

One important cause is Cryptococcus, particularly among people with advanced HIV infection.

Other fungi can cause meningitis depending on:

• geographic location,
• environmental exposure,
• and immune status.

Fungal meningitis requires specific antifungal treatment.

Can Parasites Cause Meningitis?

Yes, although parasitic meningitis is uncommon.

Certain parasites can cause inflammation affecting the brain and meninges.

Exposure routes vary considerably depending on the organism.

Some rare infections can be extremely serious.

Treatment depends entirely on the cause, so professional diagnosis is essential.

How Does Meningitis Spread?

There is no single answer because meningitis itself is not transmitted in one universal way.

Transmission depends on the organism causing it.

Many bacteria capable of causing meningitis are carried in the nose and throat and can spread through respiratory droplets or throat secretions during sufficiently close contact.

Some viruses causing meningitis spread through:

• respiratory secretions,
• faecal contamination,
• close personal contact,
• or insect bites.

Group B streptococcus can be transmitted from a pregnant person to a baby around the time of childbirth.

Other causes of meningitis are not spread directly from person to person.

Can You Catch Meningitis From Someone?

Sometimes.

Certain infections causing meningitis can spread between people.

However, casual contact does not automatically mean someone will develop meningitis.

For example, meningococcal bacteria generally require close or prolonged contact for transmission.

Public-health authorities may identify people who have had sufficiently close contact with someone diagnosed with meningococcal disease and recommend preventive antibiotics.

Do not take antibiotics simply because you have been in the same building as someone with meningitis. Follow professional public-health advice.

What Are the Symptoms of Meningitis?

Symptoms vary according to:

• age,
• cause,
• severity,
• and how quickly the illness develops.

Common symptoms in older children and adults can include:

• fever,
• severe headache,
• stiff neck,
• nausea,
• vomiting,
• sensitivity to light,
• confusion,
• difficulty concentrating,
• unusual sleepiness,
• and difficulty waking.

Seizures can occur in severe illness.

Not everyone develops every symptom.

The Classic Meningitis Symptoms

The combination most commonly associated with meningitis is:

• fever,
• headache,
• and neck stiffness.

However, relying on this combination alone is dangerous.

A person with meningitis may not have all three symptoms.

Symptoms can also develop in different orders.

If someone appears seriously ill and meningitis is possible, seek urgent medical care.

Does Meningitis Always Cause a Rash?

No.

This is extremely important.

Meningitis does not always cause a rash.

A characteristic non-blanching rash can develop with meningococcal bloodstream infection, but it may appear late or not appear at all.

Do not wait for a rash before seeking emergency medical help if other concerning symptoms are present.

What Does a Meningococcal Rash Look Like?

Meningococcal sepsis can produce a rash consisting of red, purple or dark spots that do not fade when pressure is applied.

On darker skin tones, the rash may be harder to see.

Check areas such as:

• palms,
• soles,
• inside the eyelids,
• roof of the mouth,
• and other lighter areas of skin.

However, the absence of a visible rash does not rule out meningococcal disease.

A seriously ill person should receive urgent care regardless of whether a rash is present.

Symptoms of Meningococcal Sepsis

Bloodstream infection may cause additional symptoms such as:

• cold hands and feet,
• rapid breathing,
• severe muscle or limb pain,
• pale, mottled or unusually coloured skin,
• low blood pressure,
• extreme weakness,
• confusion,
• and a non-blanching rash.

Sepsis can progress rapidly.

Seek emergency medical care immediately if it is suspected.

Meningitis Symptoms in Babies

Babies may not show the classic symptoms seen in adults.

Possible signs include:

• fever,
• irritability,
• unusual behaviour,
• poor feeding,
• vomiting,
• extreme sleepiness,
• difficulty waking,
• weak or continuous crying,
• reduced activity,
• stiffness,
• or a bulging soft spot on the head.

A baby with suspected meningitis requires urgent medical assessment.

Do not wait for all symptoms to appear.

Symptoms in Young Children

Young children may develop:

• fever,
• vomiting,
• headache,
• irritability,
• unusual sleepiness,
• confusion,
• neck stiffness,
• sensitivity to light,
• poor appetite,
• seizures,
• or difficulty waking.

Parents and caregivers may simply notice that the child is behaving very differently from normal.

A child who appears seriously ill should be urgently assessed.

Who Is at Increased Risk?

Meningitis can affect anyone at any age.

Risk varies according to the specific cause.

People who may have increased risk of certain forms include:

• babies and young children,
• adolescents and young adults for some meningococcal strains,
• older adults,
• people with weakened immune systems,
• people without a functioning spleen,
• people living in crowded settings,
• people exposed during outbreaks,
• and travellers to areas where particular forms are more common.

Vaccination recommendations therefore differ between countries and populations.

Meningitis in the African Meningitis Belt

The world's highest burden of meningococcal meningitis occurs in the African meningitis belt.

This region stretches across sub-Saharan Africa from approximately Senegal in the west to Ethiopia in the east.

Large outbreaks have historically occurred there, particularly during the dry season.

Vaccination campaigns have substantially reduced disease caused by some meningococcal strains, but surveillance and vaccination remain important.

How Is Meningitis Diagnosed?

Diagnosis requires urgent clinical assessment.

Healthcare professionals may use:

• medical history,
• physical examination,
• blood tests,
• cerebrospinal fluid testing,
• and sometimes brain imaging.

A lumbar puncture is an important diagnostic procedure for many patients with suspected meningitis.

What Is a Lumbar Puncture?

A lumbar puncture involves inserting a needle into the lower back to collect a small sample of cerebrospinal fluid (CSF).

The fluid can be tested for signs of infection and to help determine which organism is responsible.

Laboratory tests may identify:

• bacteria,
• viruses,
• fungi,
• and other causes.

The results can guide treatment.

Should Treatment Wait for a Lumbar Puncture?

No, not when bacterial meningitis is strongly suspected.

WHO guidance emphasizes that a lumbar puncture should not delay antibiotic treatment when bacterial meningitis is suspected.

Because the disease can progress rapidly, antibiotics may need to be started before laboratory confirmation is available.

How Is Bacterial Meningitis Treated?

Bacterial meningitis requires urgent treatment in an appropriate healthcare facility.

Treatment commonly includes intravenous antibiotics.

The specific antibiotics depend on factors such as:

• age,
• likely organism,
• immune status,
• local antimicrobial resistance,
• and laboratory results.

Treatment should begin as soon as possible when bacterial meningitis is suspected.

Are Steroids Used for Meningitis?

In appropriate cases, corticosteroids may be given alongside initial antibiotic treatment.

WHO's current global guidance recommends intravenous corticosteroids with the first dose of antibiotics in appropriate non-epidemic bacterial meningitis settings.

The purpose is to reduce damaging inflammation and lower the risk of neurological complications and death.

Treatment decisions should be made by healthcare professionals.

How Is Viral Meningitis Treated?

There is no single treatment for all viral meningitis.

Many mild cases improve with supportive care.

Treatment may include:

• rest,
• fluids,
• pain relief,
• and monitoring.

Some people require hospital treatment.

Antiviral medicines may be appropriate for meningitis caused by certain viruses, such as herpes viruses.

Because bacterial and viral meningitis can initially look similar, professional assessment remains essential.

Can Meningitis Be Prevented?

Some—but not all—forms of meningitis can be prevented.

The most important prevention methods include:

• vaccination,
• appropriate antibiotics for certain close contacts,
• good respiratory hygiene,
• hand hygiene,
• reducing exposure to infections where possible,
• and appropriate care during pregnancy and childbirth for certain bacterial risks.

Vaccination has had a major impact on several important causes of bacterial meningitis.

Vaccines That Can Help Prevent Meningitis

Vaccines are available against several organisms capable of causing meningitis.

These include vaccines targeting:

• meningococcal bacteria,
• pneumococcal bacteria,
• and Haemophilus influenzae type b (Hib).

Vaccines against some viral infections can also reduce cases of viral meningitis, including vaccines against:

• measles,
• mumps,
• chickenpox,
• influenza,
• and shingles in appropriate populations.

There is no single vaccine that prevents every type of meningitis.

Meningococcal Vaccines

Different meningococcal vaccines protect against different groups of Neisseria meningitidis.

Which vaccine is recommended depends on:

• age,
• country,
• outbreak conditions,
• travel destination,
• underlying medical conditions,
• and local immunization programmes.

Follow the vaccination recommendations in your country.

Pneumococcal Vaccines

Streptococcus pneumoniae can cause:

• meningitis,
• pneumonia,
• bloodstream infections,
• and other illnesses.

Pneumococcal vaccines protect against important strains.

They are particularly important for certain:

• infants and children,
• older adults,
• and people with medical conditions that increase their risk.

Recommendations vary internationally.

Hib Vaccine

Before widespread vaccination, Haemophilus influenzae type b was a major cause of serious bacterial meningitis in young children.

Routine Hib vaccination has dramatically reduced disease in countries with high vaccination coverage.

Maintaining vaccination programmes remains important.

Preventive Antibiotics for Close Contacts

Some people who have had close contact with a person diagnosed with meningococcal disease may be offered antibiotics.

This is called post-exposure prophylaxis.

The purpose is to eliminate meningococcal bacteria carried in the nose or throat and reduce the risk of further disease.

Not everyone who has been near an infected person needs antibiotics.

Public-health professionals determine who qualifies based on the nature and duration of contact.

Hand and Respiratory Hygiene

Good hygiene can reduce transmission of some infections that can cause meningitis.

Helpful practices include:

• washing hands regularly,
• covering coughs and sneezes,
• avoiding sharing items contaminated with saliva,
• cleaning frequently touched surfaces when appropriate,
• and avoiding close contact when seriously ill with an infectious disease.

These measures complement vaccination rather than replace it.

Should Someone With Meningitis Be “Separated From the Public”?

Infection-control requirements depend on what caused the meningitis.

Some forms are contagious under particular circumstances; others are not transmitted from person to person at all.

Healthcare and public-health professionals determine:

• whether isolation is necessary,
• how long precautions are required,
• which contacts need follow-up,
• and whether preventive medication is appropriate.

Can Healthy Eating Prevent Meningitis?

A nutritious diet supports general health, but there is no evidence that eating vegetables, fruits or whole grains specifically prevents meningitis.

Likewise, exercise does not provide specific immunity against meningitis.

Healthy living remains valuable, but it should not replace:

• vaccination,
• appropriate infection control,
• rapid medical assessment,
• or preventive antibiotics when indicated.

Can Someone Recover Completely From Meningitis?

Yes.

Many people recover fully, particularly with early diagnosis and appropriate treatment.

However, bacterial meningitis can cause long-term complications.

Possible effects include:

• hearing loss,
• seizures,
• weakness,
• problems with memory or concentration,
• learning difficulties,
• vision problems,
• balance problems,
• and emotional or psychological effects.

Children may experience developmental or educational difficulties following severe illness.

Follow-Up After Meningitis

Recovery does not always end when someone leaves hospital.

Depending on the illness and complications, follow-up may involve:

• hearing assessment,
• neurological evaluation,
• rehabilitation,
• physiotherapy,
• psychological support,
• developmental assessment for children,
• and educational support.

WHO's modern approach to meningitis care specifically recognizes the importance of long-term care and support for survivors.

When Should You Seek Emergency Medical Care?

Seek urgent emergency medical care immediately if meningitis is suspected.

Warning signs can include:

• severe headache with fever,
• stiff neck,
• confusion,
• unusual difficulty waking,
• seizures,
• severe sensitivity to light,
• repeated vomiting with other meningitis symptoms,
• rapidly worsening illness,
• a non-blanching red or purple rash,
• or symptoms of sepsis.

For babies, urgent warning signs include:

• unusual or continuous crying,
• extreme sleepiness,
• difficulty waking,
• poor feeding,
• a bulging soft spot,
• seizures,
• unusual stiffness or floppiness,
• or appearing seriously unwell.

Contact your local emergency medical service or go immediately to an appropriate emergency healthcare facility.

Do not wait for every classic symptom to develop.

Do not wait for a rash.

The Bottom Line

Meningitis is inflammation of the protective membranes surrounding the brain and spinal cord.

It can be caused by:

• bacteria,
• viruses,
• fungi,
• parasites,
• and, less commonly, non-infectious conditions.

Bacterial meningitis is particularly dangerous and can become fatal very rapidly.

Common warning signs include:

• fever,
• severe headache,
• stiff neck,
• vomiting,
• sensitivity to light,
• confusion,
• and unusual sleepiness.

Babies may show different symptoms, including:

• poor feeding,
• irritability,
• continuous crying,
• difficulty waking,
• and a bulging soft spot.

A rash is not always present, so never wait for one before seeking help.

Vaccination can prevent several important causes of meningitis, including disease caused by meningococcus, pneumococcus and Hib.

Some close contacts of people with meningococcal disease may also need preventive antibiotics.

Most importantly, suspected meningitis requires urgent medical attention.

Rapid diagnosis and treatment can save lives and reduce the risk of permanent disability.

Medical Disclaimer

This article provides general health information for an international audience and is not a substitute for medical diagnosis or emergency treatment. Meningitis can progress rapidly, and symptoms vary by age and cause. If meningitis or meningococcal disease is suspected, seek urgent medical care immediately or contact the appropriate emergency medical service where you live. Do not wait for a rash or for all symptoms to appear.

Sources and Further Reading

World Health Organization — Meningitis Fact Sheet

https://www.who.int/news-room/fact-sheets/detail/meningitis

World Health Organization — Meningitis Health Topic

https://www.who.int/health-topics/meningitis/

World Health Organization — Guidelines on Meningitis Diagnosis, Treatment and Care

https://www.who.int/publications/i/item/9789240108042

World Health Organization — Practical Manual on Meningitis Diagnosis, Treatment and Care

https://www.who.int/publications/i/item/9789240121027

Centers for Disease Control and Prevention — About Viral Meningitis

https://www.cdc.gov/meningitis/about/viral-meningitis.html