Reference article: Facts about Legionnaires' disease.

One of the main risks of this rare blood disorder is internal bleeding into muscles, joints and soft tissue.

Anemia is a common condition that may be caused by a shortage of iron, abnormal bleeding, infections, cancer or gastrointestinal problems.

Psilocybin, like other psychedelics, is illegal, but controlled doses may have therapeutic effects.

Neuroblastoma is a rare form of childhood cancer that occurs when early forms of nerve cells don't develop correctly.

Pneumonia is a common infection that causes inflammation in one or both lungs. It's typical symptoms are a cough with phlegm, fever, chills and difficulty breathing.

Reference Article: Facts about malaria.

Reference Article: Facts about meningitis.

Most people bitten by a West Nile virus mosquito won't get sick, but in a small percentage of people, the virus invades the brain and spinal cord, which results in serious illness.

The Eastern equine encephalitis virus is spread by mosquitoes and, in rare cases, can lead to a life-threatening brain infection.

People with cystic fibrosis produce a thick, sticky mucus that causes wide-ranging problems in the lungs, pancreas and digestive system.

Psoriasis causes new skin cells to grow in days rather than weeks. New skin builds up rapidly, forming thick patches and scales on the surface.

Osteoporosis is most common in postmenopausal women and may occur without much warning.

A rare psychological occurrence, Stockholm syndrome is when hostages develop positive feelings toward their captors during an abduction incident.

Alzheimer's disease, the most common form of dementia, causes memory and thinking problems, as well as behavioral changes in older adults.

Why is keeping the balance of sodium in our bodies so important?

About 60,000 Americans are diagnosed with Parkinson's disease each year.