In Spain, doctors diagnose around 1,000 cases of meningitis each year, information from the Sociedad Española de Neurología, or SEN. Almost 90% are linked to viral or bacterial infections. SEN reports that at least 10% of cases are very severe. The inflammation affects the meninges around the brain and spinal cord.
Bacterial meningitis is less common but more dangerous. Viral meningitis accounts for most cases and often follows a milder, self-limited course. Bacterial meningitis makes up 5% of cases and can worsen quickly. It can cause death or long-term complications.
Spain recorded 336 cases of invasive meningococcal disease in 2024, a 24.5% increase from the previous year. The incidence was 0.68 cases per 100,000 inhabitants, information from the Sociedad Española de Neurología.
Timing matters.
A high fever accompanied by an unusually severe headache and a stiff neck needs urgent medical attention. Nausea and projectile vomiting may follow; sensitivity to light, confusion or marked drowsiness can also develop, making it difficult to stay awake. Reddish or violet skin spots that do not fade when pressed are another warning sign. The World Health Organization and UK health guidance list these symptoms. Meningitis remains possible even if only some appear.
The early signs are often less clear. General discomfort and fever can resemble an ordinary infection, delaying suspicion. Dra. Ágata León, head of the Internal Medicine Service at Hospital Universitari Sagrat Cor, says hospital teams assess the symptoms and how they began. They also track how quickly symptoms are changing and how severely the patient is affected.
In 2025, 24 of the 26 countries in the WHO African Region reported 21,526 suspected meningitis cases and 971 deaths. The reported case-fatality rate was 4.5%, according to the World Health Organization, a reminder of the disease's continuing global burden.
Babies and infants may show different signs. Neck stiffness may be absent. A baby may instead become very irritable, less active or hard to wake. Refusing to feed, or an unusual and persistent cry, can also signal a problem. Official UK guidance lists a bulging fontanelle and seizures as possible warning signs.
Meningitis has several forms. Doctors classify it by its cause and timing, as well as the features of the cerebrospinal fluid. Viral and bacterial infections are common causes. Fungi and parasites can also cause infectious meningitis. Non-infectious forms include neoplastic meningitis, alongside autoimmune and drug-related forms, particularly when the condition is aseptic and cultures are negative.
Doctors confirm the diagnosis by examining cerebrospinal fluid taken during a lumbar puncture. The test can show whether meningitis is present and identify the responsible microorganism. Doctors interpret the results alongside the patient's age and risk factors. Immunosuppression, trauma or previous neurosurgery can affect the assessment.
Treatment cannot wait when bacterial meningitis is suspected. Doctors give antibiotics urgently. They may use antiviral medication in some cases when the cerebrospinal fluid has viral characteristics and the clinical assessment supports that choice. The medical team also checks how the illness is affecting other organs. That assessment helps guide treatment and follow-up.
Do not wait for every classic symptom.
A sudden change from a person's usual condition can justify urgent assessment. So can an unexpectedly severe course in an infection that first looks ordinary. NHS and other health-service recommendations say suspected meningitis or sepsis requires emergency help because the condition can worsen quickly. Only clinical evaluation and cerebrospinal fluid analysis can distinguish the possible forms and determine the right treatment.
