Conditions

Sinusitis is swelling of the sinuses, usually caused by an infection. It's common and usually clears up on its own within 4 weeks. But medicines can help if it's taking a long time to go away.

Sjögren's syndrome (also known as Sjögren's disease) is a condition where the glands that produce fluid, such as tears and spit (saliva), stop working properly. It can affect your daily life, but treatments can help ease the symptoms.

A skin abscess is a painful lump on the skin that contains pus. Some abscesses go away by themselves, but you may need to get treatment from a GP.

Skin cysts are round lumps, often filled with fluid or pus. They're usually harmless and often do not need treatment. But see a GP if you have an unexplained lump.

Skin tags are soft, skin-coloured growths on the skin. They are very common and are usually small and harmless.

Slapped cheek syndrome (also called fifth disease) is common in children and should get better on its own within 3 weeks. It's rarer in adults, but can be more serious.

Sleep apnoea is when your breathing stops and starts while you sleep. The most common type is called obstructive sleep apnoea (OSA). Sleep apnoea needs to be treated because it can lead to more serious problems.

Sleep paralysis is when you cannot move or speak as you are waking up or falling asleep. It can be scary but it's harmless and most people will only get it once or twice in their life.

Sleepwalking is when you get up and move around while you're asleep. It does not usually need treatment, but it's important to keep yourself safe.

A slipped disc, also called a prolapsed or herniated disc, is when a soft cushion of tissue between the bones in your spine bulges outwards. It's painful if it presses on nerves. It usually gets better slowly with rest, gentle exercise and painkillers.