Chilblains are itchy, red swollen tender areas of skin that develop on the exposed skin of fingers, toes or rims of ears after exposure to cold at temperatures above O° Celsius.

An anal fissure is a common, mostly benign, condition that can be acute or chronic.

Most people can ascend to a level of 2000 metres in one day without getting sick. Acute mountain sickness is the mildest form of altitude sickness, but can develop into more dangerous forms of altitude sickness.

Raynaud phenomenon is an intermittent constriction of the blood flow to the fingers and toes precipitated by cold, emotion and some drugs that cause spasm of the small arteries bringing blood to the fingers and toes.

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St John's wort is a herb used as a complementary medicine, often in the treatment of depression. Find out about its uses, side effects and interactions.

Achalasia is a disorder in which food and drink does not pass normally through the oesophagus and enter the stomach, but becomes stuck or comes back into the mouth. Symptoms of achalasia may take years to develop.

Neutropenia is a blood condition characterised by low concentration of neutrophils. These are a type of white blood cell which fight infection.

Angina can affect people in different ways and the symptoms may vary at different times. It usually lasts only a few minutes and can be relieved by rest and/or medicines.

If you have high blood pressure your doctor may recommend lifestyle measures, such as diet and exercise, and possibly also medicines to control your blood pressure. Find out about the different options.