Brain and Nervous System Medical Reference

Encephalopathy happens when a change in your body or your brain affects how well you think. Learn the causes, symptoms, treatments and more.

Learn what conditions can make you feel dizzy and nauseated, and what other symptoms you might have with them.

Find out about the many different types of paralysis (when you can’t move parts of your body after something goes wrong with their connection to your brain).

Nerve problems can be hard to pin down. Learn about a possible cause of pain, numbness and tingling in your arms and hands: thoracic outlet syndrome.

Hydrocephalus is a buildup of fluid in your brain. Learn more about its causes, symptoms, and treatments.

Talking is something we often take for granted. But what if you suddenly can't get the words out or can't say them in your usual way? Find out what could be causing your sudden speech problems and what you can do about it.

When you hear a word, do you see a color or taste a food? You may have the condition, synesthesia, You perceive one sense through another of your senses.

Empty sella syndrome affects the pituitary gland but may not cause symptoms. Learn more about the condition, including symptoms, diagnosis, and treatment.

If a loved one is suddenly acting confused, you need to get help right away. Learn what causes sudden confusion and how it’s treated.

Learn about cranial ultrasound, which can see inside your baby’s brain.

If you are feeling dizzy constantly, your doctor may perform a Dix-Hallpike Test in order to perform a vertigo diagnosis. Learn more about the examination and what the results mean.

If you’ve been back from a cruise for weeks, but still feel like you’re rocking and swaying, you might have mal de debarquement syndrome. Learn what causes it, what the symptoms are, and how it’s treated.

Everything you think, feel, and do is controlled by your nervous system. Learn how it works and what kinds of things can go wrong.

A landmark 2017 study by Boston University researchers found that the brains of 110 of 111 deceased NFL players they examined showed signs of CTE.

You can get Wernicke-Korsakoff syndrome when you don’t have enough vitamin B1. Learn the causes, symptoms, and treatments for this disease.

Neck pain or an injury can leave you feeling dizzy. This condition, known as bow hunter’s syndrome or rotational vertebral artery syndrome, makes you feel faint or dizzy when you turn your head.

Pseudotumor cerebri feels like a brain tumor, but it isn't. Learn what to do if you have the symptoms.

Does a whisper in your ear or the sight of someone folding towels make your scalp tingle? You might have autonomous sensory meridian response (ASMR).

When you see something that’s not really there, it can be scary, but there’s usually a clear reason for it. Learn what can cause these visual hallucinations, how your doctor will test for them, and what kind of treatment you might need.

Learn the causes, symptoms, and treatments for this group of rare diseases that make muscles weak or unable to move.

Powassan is a tick-borne illness that causes swelling in the brain and spinal cord. It used to be rare, but cases could be on the rise.

Thanks to technology, social services and other support, people who have cerebral palsy (CP) have better chances than ever to lead independent, fulfilling lives as adults.

WebMD explains the liquid that protects your brain and what kind of powerful clues it can give your doctor.

If you're very sensitive to certain everyday sounds, you may have a condition called hyperacusis. WebMD explains what you need to know about this hearing disorder and how to get help.

The experts at WebMD explain sound therapy, how it works, and whether it might be right for you.