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Salmonella infections are diarrheal infections caused by the bacteria salmonella. The salmonella germ is actually a group of bacteria that can cause diarrheal illness in humans...

Sarcoidosis is a disease that results from a specific type of inflammation of tissues of the body. It can appear in almost any organ, but it starts most often in the lungs or lymph nodes.

Learn more about the different types of scars and make an appointment with a Northwell Health dermatologist.

Learn more about the causes and symptoms of schizophrenia and how Northwell behavioral health specialists treat this disease.

Learn about schwannoma diagnosis, symptoms, causes and treatments at Northwell Health’s Brain Tumor Center.

Scleroderma, also called systemic sclerosis, is a chronic, degenerative disease that affects the joints, skin, and internal organs. Scleroderma is also associated with blood vessel abnormalities...

Learn more about the symptoms and causes of scleroderma and how the specialists at Northwell Health treat this condition.

Scoliosis is a spinal deformity that causes an abnormal curvature of the spine. A normal spine appears straight when viewed from behind, whereas a spine affected by scoliosis shows a lateral curvature, giving the appearance that the person is leaning to one side. The spine will often be shaped like an “S” or a “C.” The curvature must be 10 degrees or greater to be considered scoliosis.

Learn about seizure diagnosis, symptoms, causes and treatments at the Northwell Health Comprehensive Epilepsy Center.

Severe acute respiratory syndrome is an infectious respiratory disease. Commonly referred to as SARS, the infection is caused by a virus and easily spread from person to person.

STDs are infections derived from any type of sexual contact, including oral, vaginal or anal intercourse. Common types of STDs include human immunodeficiency virus (HIV), human papillomavirus (HPV), chlamydia, gonorrhea, genital herpes and syphilis...

Sexually transmitted diseases are infections derived from any type of sexual contact, whether it’s oral, vaginal or anal intercourse.

Shin splints are defined as damage to one or more areas along the shinbone that causes pain. One of the most common sports injuries, they are often associated with runners or any athlete who has repetitive strain on the muscles in this area. As the tendons around the tibia (shinbone) become inflamed, they can cause pain, usually on the inside of the shin. Shin splints account for approximately 17 percent of all running injuries.

Learn about Shingles diagnosis, symptoms, causes and treatments at Northwell Health’s Nerve Disorders Center.

Shortness of breath, also known as dyspnea, is difficulty breathing or catching your breath. It can be mild and happen during light physical activity. It can also be severe enough to prevent walking, talking or eating...

Learn about shoulder fracture fixation surgery and the shoulder and elbow specialists who perform these procedures at Northwell Health Orthopaedic Institute.

There are two types of rotator cuff pain associated with shoulder impingement (friction between the rotator cuff and the shoulder blade): bursitis and tendonitis. The groups most at risk for bursitis and tendonitis are athletes, the middle-aged and people whose work requires them to use their arms over their heads and/or frequently lift things. Bursitis and tendonitis are not acute conditions; they involve damage done over a period of time. Without proper medical intervention and care, shoulder impingement can turn into a torn rotator cuff.

Shoulder replacement is joint replacement surgery to treat conditions such as arthritis of the shoulder, rotator cuff tear and fracture of the shoulder blade.

Sick sinus syndrome is not a specific disease, but rather a group of signs or symptoms that indicate the sinoatrial node (the heart's natural pacemaker) is not functioning properly.

Skin cancer happens when cells from your skin grow abnormally and out of control. The cancer cells can spread to other parts of your body.

Learn more about skin rashes and inflammation and how the dermatologists at Northwell Health treat these conditions.

Skull base tumors, also known as cranial base tumors, can often be asymptomatic (without symptoms) until they compromise neighboring structures, so they are often found at advanced stages.

Sleep apnea is a breathing disorder characterized by brief interruptions of breathing during sleep. Learn more at the New York Head and Neck Institute.

The loss of the senses of smell (anosmia) and taste (ageusia) are the most common chemosensory disorders. The reduced ability to smell (hyposmia) or to taste sweet, sour, bitter, or salty substances (hypogeusia) are also common...

Snoring is the sound that occurs during sleep when flow of air is obstructed in the area where the tongue and upper throat meet the soft palate and uvula...

Soft tissue sarcoma is cancer of certain tissues of the body, such as the muscles, connective tissues (like tendons), blood vessels, bones and fat.

Learn about Spinal Arteriovenous Malformation diagnosis, symptoms, causes and treatments at Northwell Health’s Spine Center.

Any fracture that affects the spinal column or any of the bones within that area of the skeletal system is a spinal fracture, also known as a vertebral fracture. Additional injuries also are common with this type of fracture because of the amount of force it takes to injure the spine.

Spinal stenosis is a narrowing of the spinal canal and occurs most often in people over 50 years of age. As the canal narrows, it puts pressure on the spinal cord and nerves in the canal, causing pain and other symptoms. When the spinal canal narrows in the neck area of your spine, it is called cervical spinal stenosis. In the lower part of your spine, it is known as lumbar spinal stenosis.

Spinal tumors are growths that develop on the bones and ligaments of the spine, on the spinal cord, or on nerve roots. These tumors can be noncancerous (benign) or cancerous (malignant).

Learn about Spinocerebellar Ataxia (SCA1) diagnosis, symptoms, causes and treatments at Northwell Health’s Movement Disorder Center.

Spondylolisthesis is a spinal disorder in which one or more vertebrae become displaced toward the front of the body, usually in the lumbar spine (lower back), commonly following a fracture.

Spondylosis is age-related change of the bones (vertebrae) and discs of the spine. These changes are often called degenerative disc disease and osteoarthritis. When this condition is in the lower back, it's called lumbar spondylosis.

A sprained ankle is a very common injury; according to the American Academy of Orthopaedic Surgeons (AAOS), approximately 25,000 people a day experience a sprained ankle. A sprained ankle happens when an ankle ligament is forced to stretch past its normal range of motion.

Stiff big toe, also known as hallux rigidus, is an arthritic condition in the big toe that causes the joint to stiffen. Because the big toe is so involved in movement of the feet, hallux rigidus can make walking painful and difficult...

Stomach cancer occurs when abnormal cells grow out of control in one of the three layers of the stomach. Several types of cancer can occur in the stomach.

Learn more about what causes strabismus, symptoms and world-class eye treatments available at Northwell Health.

A streptococcal, or strep, infection is caused by bacteria and can be mild to severe. The two types of strep bacteria are Group A and Group B. Group A strep can cause infections including: Impetigo, a mild skin infection Strep throat, a sore throat often with white spots on the tonsils Scarlet fever, a complication of strep throat that causes a red skin rash Toxic shock syndrome, an invasive strep infection that causes a rapid drop in blood pressure and organ failure in the kidneys, liver or lungs Necrotizing fasciitis, an invasive strep infection also called "flesh-eating bacteria" that destroys muscle, fat, and skin tissue Group B strep mainly affects newborns, but also adults, with infections such as: Blood infections Pneumonia Bacterial meningitis Skin infections (in adults) Urinary tract infections (in adults) Bone and joint infections (in adults) Symptoms of streptococcal infections vary widely because there are many types of infections...

Stress fractures are a common overuse injury in athletes, but can also occur in non-athletes. They occur when a person has a partial fracture in one of the bones. Unlike with other broken bones, these fractures are not caused by direct impact; instead, these small breakages usually occur in weight-bearing bones such as the shinbone and foot bones and are caused by trauma accumulated over time.

Lean more about what causes a stroke, sings of a stroke and world-class stroke treatment available at Northwell Health.

Structural heart disease and heart defects refer to a defect or abnormality in the heart's valves or vessels. These defects can involve the interior walls of the heart, the valves inside the heart, and the arteries and veins that carry blood to the heart or out to the body.

A subarachnoid hemorrhage is a condition where there is bleeding into the subarachnoid space between the pia mater (inner layer) and arachnoid mater (middle layer) of the tissue covering the brain...

When you are diagnosed with cancer, there is a physical, emotional and social impact. As part of our dedication to patient-centered care, we offer individualized supportive services designed to help you cope during your treatment and continue to thrive after treatment.

Learn about syncope diagnosis, symptoms, causes and treatments at Northwell Health.