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People are less sensitive to smells the older they get, and women tend to have a more acute sense of smell than men.

Porphyria can affect the skin, nervous system, gastrointestinal system or all of these, depending on the specific type.

Symptoms of fish and shellfish allergies vary and range from milder reactions to a life-threatening severe allergic reaction (anaphylaxis).

A person's blood group is determined by a pair of genes, one each inherited from their mother and father.

Henoch-Schonlein purpura causes a purple spotted skin rash which lasts around one to four weeks, and is often marked by relapses.

Antioxidants scavenge free radicals from the body's cells, and prevent or reduce the damage caused by oxidation.

Premature ejaculation is the most common sexual problem in in the world.

Using a mobile phone while driving greatly increases the risk of traffic accidents.

Hughes syndrome is thickening of the blood caused by abnormal immune system cells.

Loss of memory can be temporary or permanent, but 'amnesia' usually refers to the temporary variety.