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Hydrocephalus, or fluid on the brain, causes slightly different symptoms depending on the type of hydrocephalus and the age of the person affected.

Hydrocephalus from birth

Babies born with hydrocephalus (congenital) often have distinctive physical features.

These can include:

Congenital hydrocephalus can also cause:

Congenital hydrocephalus is sometimes picked up before a baby is born during an ultrasound scan.

However, it's usually diagnosed soon after birth during the newborn physical examination. The problem may be suspected if your baby's head is larger than normal.

Hydrocephalus that develops in adults or children

Hydrocephalus that develops in adults or children (acquired) can cause headaches.

The headache may be worse when you wake up in the morning because the fluid in your brain does not drain so well while you're lying down and may have built up overnight.

Sitting up for a while may improve your headache. However, as the condition progresses, the headaches may become continuous. 

Other symptoms of acquired hydrocephalus include:

Call your GP or NHS 111 if you think you or your child may have symptoms of hydrocephalus.

Normal pressure hydrocephalus (NPH)

The symptoms of normal pressure hydrocephalus (NPH) tend to affect older people and usually develop slowly, over the course of many months or years.

NPH has 3 sets of distinctive symptoms. It affects:

See your GP if you have any of the symptoms described below.

How you walk

The first noticeable symptom of NPH is a change in how you walk (your gait). You may find it increasingly difficult to take the first step when you want to start walking.

Some people have described it as feeling as though they're frozen to the spot. You may also shuffle rather than take proper steps.

As the condition progresses, you may become increasingly unsteady on your feet and be more likely to fall, particularly when turning.

Urinary symptoms

The change in the way you walk is often followed by bouts of urinary incontinence, which may include symptoms such as:

Mental abilities

The normal thinking process also starts to slow down. This can take the form of:

These symptoms may indicate that you have mild dementia. They should start to improve when NPH is treated.

Read more about how NPH is treated.