Fainting or a blackout is a temporary loss of consciousness.

Rashes are any change we notice on our skin. Rashes can have a wide variety of symptoms and appearances; they might be localised to one area of our body or they may be covering multiple areas.

A cardiac arrest is when your heart suddenly stops pumping blood around your body.

Carotid artery stenosis is a narrowing of large arteries supplying blood in the brain and face.

Most chest pain isn’t usually a sign of anything serious, but there are some underlying heart conditions that can cause chest pain.

Contact allergies, also known as allergic contact dermatitis, are a reaction to substances such as metals, scents and latex. This can cause skin reactions including skin rashes, swelling, itching, and dry skin.

Dandruff or an itchy scalp is the body’s reaction to a sensitivity to or overgrowth of a type of yeast, called Malassezia, that normally lives on the skin.

A drug allergy is an allergic reaction to medication that occurs when the immune system is incorrectly activated by a drug. Vaccine allergy is very rare. It is usually caused by allergy to an excipient in the vaccine, rather than the active ingredient.

Endocarditis is an inflammation of the lining of the heart

Excess shedding is often referred to as telogen effluvium and can be a result of general health issues and stress.

Hyperhidrosis is sweating when your body does not need to cool down. It usually affects body sites with the most sweat glands, such as the armpits, palms, soles and head and neck area.

The severity of insect venom allergy varies from person to person but can range from localised or mild, to life-threatening.

Urticaria (also called “nettle rash” or “hives”) is common and affects 20% of people at some point in their lives. The most common form is called spontaneous urticaria. Spontaneous urticaria is divided into “acute” and “chronic” forms dependent upon whether the episode lasts less than or greater than 6 weeks.

Exercise-induced anaphylaxis is an uncommon, potentially-serious condition in which anaphylaxis occurs during or after physical activity.

Flushing and blushing are common skin responses to heat and emotion.