Health Library

Articles In This Section

• A to Z: MSSA

  Learn about causes and complications of skin infections.

• A to Z: Myringitis, Infectious

  Learn about bullous myringitis, an infection of the tympanic membrane (eardrum).

• A to Z: Myringitis, Bullous

  Learn about bullous myringitis, an infection of the tympanic membrane (eardrum).

• A to Z: Myositis

  Learn about causes of muscle weakness and conditions that affect muscles and muscle tissue.

• A to Z: Myopia

  Myopia is nearsightedness, a common condition in which someone can see things that are close clearly, but things that are farther away appear blurry.

• A to Z: Myoclonus

  Learn more about the central nervous system and symptoms of nervous system disorders.

• A to Z: Myelomeningocele

  Learn about birth defects and conditions that affect the spinal cord and spinal column.

• A to Z: Myasthenia Gravis (MG)

  Learn about myasthenia gravis, an autoimmune disease that causes weakness in the voluntary muscles.

• A to Z: Myalgia

  Learn about causes of muscle pain and conditions that affect muscles and muscle groups.

• A to Z: Multiple Sclerosis (MS)

  Learn about about multiple sclerosis (MS), a chronic disease affecting the central nervous system.

• A to Z: Mucopolysaccharidosis Type II

  Mucopolysaccharidosis type II, or Hunter syndrome, is a rare genetic disorder that affects mostly males.

• A to Z: Mononucleosis

  Learn more about mononucleosis, an infection caused by the Epstein-Barr virus (EBV) with flu-like symptoms.

• A to Z: Molluscum Contagiosum

  Molluscum contagiosum is a common wart-like viral skin infection that goes away on its own over time.

• A to Z: Mononeuritis Multiplex

  Learn about complications of neurologic disorders and conditions that can affect the peripheral nerves.

• A to Z: Mitochondrial Disorder

  Mitochondrial disorders affect the function of mitochondria, tiny structures within the body's cells that turn sugar and oxygen into the energy the cells need to do their jobs.

• A to Z: Migraine, Without Aura

  A migraine without aura is a migraine headache that happens without previous warning signs (auras).

• A to Z: Migraine

  A migraine is a recurring headache that often causes nausea, dizziness, and sensitivity to light, sound, or smell.

• A to Z: Microcephaly

  Microcephaly is a rare condition in which a child's brain doesn't fully develop, resulting in an abnormally small head size.

• A to Z: Metabolic Syndrome

  Metabolic syndrome is a group of separate health problems that often happen together in a person.

• A to Z: Mental Disorder, Non-psychotic

  Learn about types of mental disorders and conditions that affect thinking and behavior.

• A to Z: Meningitis, Viral

  Sometimes viruses can spread to the meninges, the membrane around the brain and spinal cord, and cause more severe illness. Learn about it here.

• A to Z: Meningitis, Bacterial

  Learn about this rare but serious condition in which bacteria invade the membranes around the brain and spinal cord.

• A to Z: Meibomian Cyst

  A meibomian cyst, or chalazion, is a lump on the inner side of the eyelid. It occurs when one of the small oil glands becomes blocked.

• A to Z: Meatal Stenosis

  The meatus is the opening in the penis where urine (pee) comes out. In meatal stenosis, the meatus is too small.

• A to Z: Marcus Gunn Syndrome

  Marcus Gunn syndrome is a congenital condition where a drooping eyelid briefly opens wider and appears to wink when the jaw is moved.

• A to Z: MRSA

  Learn about causes and complications of skin infections.

• A to Z Symptom: Malaise and Fatigue

  Malaise and fatigue are common symptoms of many ailments.

• A to Z: Medial Collateral Ligament (MCL) Injuries

  Learn more about MCL injuries and how they're treated.