Browse our Health Library to learn about treatments, conditions, and how Cedars-Sinai can support your healthcare needs.
Magnetic resonance imaging (MRI) uses a magnetic field and radio waves to create cross-sectional images of your head and body. Your doctor uses these detailed, clear images to identify and diagnose many conditions. It is particularly ...
Depression is a serious mood disorder. It touches every part of your life and is caused by a chemical imbalance in your brain. Treatment involves medicine and counseling.
Major depression goes beyond the day’s normal ups and downs. It involves a teen’s body, mood, and thoughts. It can affect and disrupt eating, sleeping, or thinking patterns.
Malaria is caused by a parasite. It is passed to humans by the bite of an infected Anopheles mosquito.
Infertility is a disease of the reproductive system. It makes a person unable to have children. It can affect a man, a woman, or both. Male infertility means that a man has a problem with his reproductive system. It means you cannot ...
Your esophagus is the tube that carries food from your throat to your stomach. It plays a vital role in digestion. Sometimes, violent coughing or vomiting can tear the tissue of your lower esophagus and it can start to bleed. The ...
Malocclusion is when a child’s teeth become crooked or crowded. The child may also have a problem with his or her bite. That means the teeth of the upper jaw don’t meet normally with the teeth of the lower jaw when the jaw is closed.
Marfan syndrome is a genetic disorder that affects the body's connective tissue. Connective tissue holds the body's cells, organs, and other tissue together. Connective tissue is also important in growth and development.
Mastoiditis is an inflammation or infection of the mastoid bone. This bone is one of the bones in the head. It is located behind the ear. The mastoid bone is made of cells that drain the middle ear. Mastoiditis may be mild or very serious.
McArdle disease is a rare muscle disorder. In McArdle disease, the muscle cells can’t effectively store energy in the carbohydrate called glycogen.
Measles (rubeola) is a respiratory illness caused by a virus. It causes a red, blotchy rash. It’s a very contagious illness.
Meckel diverticulum is a small pouch in the wall of the intestine. It’s near where the small and large intestines meet. This condition is the most common birth defect of the digestive system. It happens to about 1 in 50 babies.
Meconium aspiration happens when a newborn breathes in a mixture of meconium and amniotic fluid. Amniotic fluid is the liquid that surrounds the baby in the womb. Meconium is the baby's first stool, or poop, which is sticky, thick, and ...
The menisci are crescent-shaped bands of thick, rubbery cartilage attached to the shinbone. They act as shock absorbers and stabilize the knee. Meniscus tears can vary widely in size and severity. Some, but not all, require surgical repair.
The medial collateral ligament's main function is to prevent the leg from extending too far inward, but it also helps keep the knee stable and allows it to rotate. Injuries to the medial collateral ligament most often happen when the ...
Medicine rashes are the body’s reaction to a certain medicine. The type of rash that occurs depends on the type of medicine that is causing it. Rashes can range from mild to severe.
Medulloblastoma is a type of brain cancer. It most often affects children, but it can also happen in adults. These tumors usually grow in the cerebellum, near the back of the brain. The cerebellum controls balance and coordination.
Anemia is a problem in which there are not enough red blood cells or hemoglobin. Hemoglobin is the part of red blood cells that carries oxygen throughout the body. In megaloblastic anemia, the bone marrow, where the cells are formed, ...
Megaureter is a ureter that is much wider than normal. A ureter that is wider than 10 mm (3/8 inch) is a megaureter. A megaureter may not drain urine normally. This can lead to infections and kidney damage.
Ménière disease is a balance disorder. It’s caused by an abnormality in part the inner ear called the labyrinth. Fluid build-up here can cause a severe spinning sensation (vertigo) and affect the hearing.
A meningioma is a tumor that grows in the meninges, the layers of tissues that cover the brain and spinal cord.
Meningitis is inflammation of the membranes that surround the brain. Meningitis can be caused by either a virus or bacteria. Bacterial meningitis may be life-threatening.
Meningitis is most often caused by a bacterial or viral infection that moves into the cerebral spinal fluid (CSF).
Meningococcal infections are not common, but they can be fatal. They occur most often in late winter and early spring. Children are more often affected, but the illnesses also occur in teens and adults.
Menorrhagia is heavy or prolonged bleeding during your period. It can be caused by hormone problems or problems with the uterus. Medications or procedures to treat the uterus can help.
Menstrual cramps (dysmenorrhea) are severe, painful cramps that occur with menstruation.
Mesenteric ischemia is decreased or blocked blood flow to your intestine.
Metabolic syndrome is a condition that includes the presence of a cluster of risk factors specific for cardiovascular disease. Metabolic syndrome greatly raises the risk of developing diabetes, heart disease, stroke, or all three.
Metatarsus adductus is a common foot deformity noted at birth. It causes the front half of the child’s foot (forefoot) to turn inward.
Microcephaly is a condition where a baby's head is much smaller than normal. It is most often present at birth (congenital). Most children with microcephaly also have a small brain and an intellectual disability. Some children with small...