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STIs (also called sexually transmissible diseases or STDs) information and resources. Including symptoms, how to prevent STIs, getting tested and treatment.

Infections are generally caused by bacteria or viruses. Learn about infectious and childhood diseases, animal to human diseases and prevention.

Fatigue is thought to cause about one in six road accidents - make sure you get enough sleep.

Allergy occurs when the body overreacts to a 'trigger' that is harmless to most people.

Asthma cannot be cured, but with good management people with asthma can lead normal, active lives.

The eye's complicated design means that an image can pass through its many layers and end up crisply focused on the retina.

A stroke is when blood can’t get to all parts of your brain and is a medical emergency. If blood can’t get through, your brain can be injured.

Middle ear infections often happen during or after a child has a cold.

A chest infection affects your lungs, either in the larger airways (bronchitis) or in the smaller air sacs (pneumonia).

It is estimated that around four out of five children will experience a middle ear infection at least once.