The femoral nerve is one of the largest nerves in the leg. The nerve and its branches supply sensation to the upper thigh and control the quadriceps muscle, which is responsible for straightening the knee. Femoral nerve pinching, or impingement, can cause various symptoms.

Finger numbness can significantly affect your ability to perform daily tasks. Normal sensation allows you to type without looking at your fingers, and prevents you from burning yourself or touching a sharp object.

"The Merck Manual Home Health Handbook" describes iron deficiency as one of the most frequent mineral deficiencies in the world. It leads to anemia, a condition that develops when your body does not produce enough healthy red blood cells to supply your organs adequately with oxygen.

Multiple sclerosis is a progressive neurological disease caused by damage to neurons in the brain and spinal cord. The damage occurs to the outer layer of the neurons, which is called the myelin sheath.

In the United States, approximately 5,600 people are diagnosed with amyotrophic lateral sclerosis, or ALS, each year, according to the ALS Association. This disease, which is also called Lou Gehrig's disease, results in the progressive decline of the motor neurons responsible for voluntary muscle movement.

A mini stroke, also known as a transient ischemic attack or a TIA, occurs when the blood flow to the brain is blocked temporarily. It often causes symptoms that mimic those of a stroke; however, according MayoClinic.com, these symptoms completely resolve between two and 24 hours.

Nervous system disorders affect your central or peripheral nervous systems, including brain, spinal cord and peripheral nerves.

The basal ganglia tissue is composed of the caudate nucleus, putamen, and globus pallidus. This area of the brain has a blood supply that can easily be blocked or suffer damage. If blood supply to the any part of the brain is interrupted, the patient suffers from a stroke.

A sudden headache over one of your eyes during exercise can prevent you from continuing your workout. The pain can last anywhere from just a few minutes to several days.

Strokes attack portions of the brain regulating fine motor skills. This often means temporary loss of arm, hand or finger function on one side of the body. But if you suffer a stroke, a drooping mouth and loss of chewing, speaking and swallowing ability also are common symptoms.

A person may live a long life with a lucid mind and good memory. However, many senior citizens have dementia, or severe intellectual deterioration involving progressive memory loss and inability to concentrate. Rarely, dementia affects people in their 50s. Various factors may cause such early dementia.

The American Headache Society claims that up to 78 percent of Americans suffer from tension headaches, 12 percent from migraines and 1 percent from cluster headaches. Headache pain around, behind or within either eye is suggestive of a cluster headache. Other causes might indicate medical emergencies.