Read about warts and verrucas, which are small lumps on the skin. Find out what causes warts and verrucas, how they're treated and when to get medical help.
Read about West Nile virus (WNV), a virus spread by mosquitoes that is found in many countries around the world.
Find out about the symptoms of whooping cough, who's at risk, when to get medical advice, and how it's treated.
Read about Wolff-Parkinson-White (WPW) syndrome, a heart condition that can cause the heart to beat abnormally fast. Find out about the symptoms, causes and treatments.
Find out about watering eyes, which can occur if too many tears are produced or they cannot drain away properly.
Weight loss surgery is sometimes used as a treatment for people who are very obese. It can lead to significant weight loss and help improve many obesity-related conditions, such as type 2 diabetes or high blood pressure.
Find out about whiplash, how it happens, what the symptoms are and how it can be treated.
The removal of wisdom teeth, or third molars, is one of the most common procedures carried out in the UK.
Cancer of the womb (uterus) is a common cancer of the female reproductive system that often causes abnormal vaginal bleeding.
Most worm infections are not serious and can be easily treated with medicine. Find out what different types of worms look like, when to get medical help, and how to treat and prevent infections.
Find out what you can do to help if you see someone having a seizure or fit.