F

• A to Z Symptom: Fainting

  In most cases, fainting is not a sign of a dangerous problem, but should still be discussed with a doctor.

• A to Z Symptom: Fever

  A fever itself is a symptom, causes no harm, and is often the body’s way of fighting infections.

• A to Z: Factor IX Deficiency (Hemophilia B)

  In factor IX deficiency (hemophilia B), the body doesn’t make enough factor IX (factor 9), one of the substances the body needs to form a clot.

• A to Z: Factor VIII Deficiency (Hemophilia A)

  In factor VIII deficiency (hemophilia A), the body doesn’t make enough factor VIII (factor 8), one of the substances the body needs to form a clot.

• A to Z: Failure to Thrive

  Failure to thrive refers to a child’s inability to gain weight and grow as expected for kids of the same age and gender. Most diagnoses are made in the first few years of life.

• A to Z: Febrile Seizures

  Febrile seizures are convulsions that can happen during a fever (febrile means “feverish”).

• A to Z: Feeding Problems, Infant

  Some babies refuse to eat or don’t eat enough. Others have problems digesting food. Learn more about common feeding problems here.

• A to Z: Fistula, Coccygeal or Pilonidal

  See: Pilonidal Cyst.

• A to Z: Flat Foot

  Flat foot is a condition in which the arches on the inside of a person’s foot have less curve to them or are flat, so that the entire sole of the foot rests on the ground when the person is standing.

• A to Z: Flatulence, Eructation, and Gas Pain

  It may seem embarrassing to talk about, but intestinal gas and the sounds and smells it causes are common and usually totally normal. Learn more here.