What is normal pressure hydrocephalus (NPH)?

Normal pressure hydrocephalus (NPH) is a condition that is caused by an abnormal accumulation of cerebral spinal fluid in the ventricles (cavities) of the brain. Cerebral spinal fluid is a clear liquid that cushions the spinal cord and brain, protecting them from damage. When people have NPH, they have an excess of cerebral spinal fluid because their bodies cannot properly drain and absorb the fluid. This fluid build-up can harm the brain.

In general, NPH affects adults over the age of 60. The condition is estimated to be present in 375,000 older Americans. However, NPH can occur in people of any age.

What causes normal pressure hydrocephalus (NPH)?

The exact cause of NPH is not clear. In some cases, people develop NPH when none of the following are present. However, the following factors have been known to lead to NPH:

What are the symptoms of NPH?