Learn more about how damaged hair follicles become infected. This condition may clear up on its own, but severe infections can cause scarring or hair loss.
Disease
Food allergy
For people with food allergies, symptoms can range from annoying to life-threatening. Learn about diagnosis and treatment of this common immune reaction.
Disease
Food poisoning
Learn more about foodborne illnesses that can cause upset stomach, vomiting and diarrhea within hours of eating contaminated food.
Disease
Foot drop
Foot drop is a general term that describes a difficulty in lifting the front part of the foot. It's often caused by compression of a nerve.
Disease
Frontal lobe seizures
In this common form of epilepsy, the seizures stem from the front of the brain. They can produce symptoms that appear to be from a mental illness.
Disease
Frontotemporal dementia
Read more about this less common type of dementia that can lead to personality changes and trouble with speech and movement.
Disease
Frostbite
Learn how to prevent cold injury to the skin when outdoors in freezing temperatures and how to treat and recover from frostbite.
Disease
Frozen shoulder
This painful condition usually begins gradually and makes the shoulder hard to move. Exercises can help restore range of motion.
Disease
Fuchs dystrophy
Fuchs dystrophy may cause eye pain and vision problems that get worse over time. Medicines can help but surgery may be needed.
Disease
Functional dyspepsia
Learn about functional dyspepsia, a digestive disorder with no clear cause. Treatment may help relieve this common condition.
This disorder includes nervous system symptoms affecting movement or the senses that are not caused by medical disease. Treatment can help with recovery.
Disease
Growth plate fractures
Growth plate fractures — This common childhood bone injury often needs immediate treatment as it can result in a shorter, longer or crooked limb.