Conditions
Sickle Cell Crisis
A sickle cell crisis is a sudden, painful episode that occurs in people with sickle cell disease. It happens when abnormal, sickle-shaped red blood…
Sick Sinus Syndrome
Sick sinus syndrome is a condition where your heart's natural pacemaker, called the sinus node, doesn't work correctly. This can cause your heart to…
Shoulder Dystocia
Shoulder dystocia is an unexpected and urgent situation during vaginal childbirth when a baby's head delivers, but one of their shoulders gets stuck behind…
Shoulder Arthritis
Shoulder arthritis is a condition where the smooth cartilage cushioning the bones in your shoulder joint wears away, leading to pain, stiffness, and reduced…
Septicemia
Septicemia is a serious and life-threatening condition where bacteria enter your bloodstream, causing an infection. This bloodstream infection can trigger your body's immune system…
Septic Arthritis
Septic arthritis is a serious infection inside a joint, usually caused by bacteria. It can affect any joint but most often occurs in the…
Separated Shoulder
A separated shoulder is an injury to the joint at the top of your shoulder, where your collarbone meets your shoulder blade. This joint,…
Sebaceous Carcinoma
Sebaceous carcinoma is a rare and aggressive type of cancer that begins in the sebaceous glands, which are tiny oil glands in your skin.…
Schistosomiasis
Schistosomiasis is a parasitic disease caused by tiny flatworms (flukes) that live in certain types of freshwater snails. People get schistosomiasis when their skin…
SIADH
SIADH, or the syndrome of inappropriate antidiuretic hormone secretion, is a condition where your body produces too much antidiuretic hormone (ADH). This excess hormone…
Ruptured Spleen
A ruptured spleen is a serious medical emergency where the spleen, an organ located under your left rib cage, tears or breaks open. This…
Rotavirus
Rotavirus is a highly contagious virus that causes severe watery diarrhea, vomiting, fever, and stomach pain, primarily affecting infants and young children. It is…
Right Atrial Enlargement
Right atrial enlargement means the upper right chamber of your heart, called the right atrium, has become larger than normal. This condition usually develops…
Rheumatoid Nodules
Rheumatoid nodules are firm, painless lumps that form under the skin, most often in people who have rheumatoid arthritis (RA). These nodules are a…
Rheumatic Fever
Rheumatic fever is a serious inflammatory disease that can develop as a complication of an untreated or inadequately treated strep throat infection. It occurs…
Rett Syndrome
Rett syndrome is a rare genetic neurological disorder that primarily affects girls, causing severe problems with brain development. It leads to a period of…
Dwarfism
Dwarfism is a condition characterized by short stature, meaning an adult height of 4 feet 10 inches (147 centimeters) or less. It is usually…
Diabetes-Related Retinopathy
Diabetes-related retinopathy is an eye condition caused by diabetes that damages the small blood vessels in the retina, the light-sensitive tissue at the back…
Hoarding Disorder
Hoarding disorder is a mental health condition where a person has great difficulty parting with possessions, regardless of their actual value. This leads to…
Hives in Children
Hives (urticaria) in children are itchy, raised welts on the skin that can appear suddenly and change location. They are a common skin reaction,…
Histoplasmosis
Histoplasmosis is a lung infection caused by breathing in tiny fungal spores, often found in soil contaminated with bird or bat droppings. Most people…
Hip Impingement
Hip impingement, also known as femoroacetabular impingement (FAI), occurs when the bones of the hip joint abnormally rub against each other. This happens because…
High-Risk Pregnancy
A high-risk pregnancy means you or your baby might face increased health problems before, during, or after delivery. It requires closer monitoring and special…
Herpes Simplex Virus Encephalitis
Herpes simplex virus encephalitis (HSE) is a rare but very serious brain infection caused by the herpes simplex virus. It causes inflammation of the…