Our Symptom checker provides clinical advice on what to do next based on your symptoms.
Hives is a skin rash that is often triggered by an infection or allergy. Learn to recognise symptoms.
Cat and dog allergy
Allergies to cats and dogs are common, and symptoms can be severe. Learn more about how to live with a pet allergy.
Penicillin is the name given to a widely-used group of antibiotic drugs. Penicillin can have side-effects, and some people suffer allergic reactions. Find out more here.
Allergic reactions to antibiotics
Some people have an allergic reaction to antibiotics. Learn about the symptoms and the difference between allergic reactions and side effects.
Allergies and hypersensitivities
An allergic reaction occurs when the immune system overreacts to a foreign substance that usually causes few or no problems in most people.
Itchy skin is a common irritation that can be very frustrating. Understand the different types of itchy skin and how to ease the discomfort.
Cefalexin is used to treat bacterial infections in various parts of the body. This page explains how cefalexin works, its risks and other treatment options available in its place.
Allergic reactions to cow's milk
About 1 in 50 infants has an allergic reaction to cow’s milk. Learn more here about allergy to milk proteins.
Some people have an allergic reaction to a normally harmless ingredient or type of food. This immune system response can range from mild to severe.
Antihistamine medications help ease allergy symptoms. Read more here about how they are used to treat conditions like hay fever and asthma.